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884 lines
24 KiB
884 lines
24 KiB
;======================================================================
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; N8 VDU DRIVER FOR SBC PROJECT
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;
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; WRITTEN BY: DOUGLAS GOODALL
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; UPDATED BY: WAYNE WARTHEN -- 4/7/2013
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;======================================================================
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;
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; TODO:
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; - IMPLEMENT SET CURSOR STYLE (VDASCS) FUNCTION?
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; - IMPLEMENT ALTERNATE DISPLAY MODES?
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; - IMPLEMENT DYNAMIC READ/WRITE OF CHARACTER BITMAP DATA?
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;
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;======================================================================
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; TMS DRIVER - CONSTANTS
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;======================================================================
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;
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TMSCTRL1: .EQU 1 ; CONTROL BITS
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TMSINTEN: .EQU 5 ; INTERRUPT ENABLE BIT
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#IF TMSTIMENABLE
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.ECHO "TMS INTERRUPTS ENABLED"
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#ENDIF
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#IF (TMSMODE == TMSMODE_RC2014)
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TMS_DATREG .EQU $BE ; READ/WRITE DATA
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TMS_CMDREG .EQU $BF ; READ STATUS / WRITE REG SEL
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TMS_PPIA .EQU 0 ; PPI PORT A
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TMS_PPIB .EQU 0 ; PPI PORT B
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TMS_PPIC .EQU 0 ; PPI PORT C
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TMS_PPIX .EQU 0 ; PPI CONTROL PORT
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#ENDIF
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#IF (TMSMODE == TMSMODE_N8)
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TMS_DATREG .EQU $98 ; READ/WRITE DATA
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TMS_CMDREG .EQU $99 ; READ STATUS / WRITE REG SEL
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TMS_PPIA .EQU $84 ; PPI PORT A
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TMS_PPIB .EQU $85 ; PPI PORT B
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TMS_PPIC .EQU $86 ; PPI PORT C
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TMS_PPIX .EQU $87 ; PPI CONTROL PORT
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#ENDIF
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#IF (TMSMODE == TMSMODE_SCG)
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TMS_DATREG .EQU $98 ; READ/WRITE DATA
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TMS_CMDREG .EQU $99 ; READ STATUS / WRITE REG SEL
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TMS_ACR .EQU $9C ; AUX CONTROL REGISTER
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TMS_PPIA .EQU 0 ; PPI PORT A
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TMS_PPIB .EQU 0 ; PPI PORT B
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TMS_PPIC .EQU 0 ; PPI PORT C
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TMS_PPIX .EQU 0 ; PPI CONTROL PORT
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#ENDIF
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;
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TMS_ROWS .EQU 24
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TMS_COLS .EQU 40
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;
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#DEFINE USEFONT8X8
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#DEFINE TMS_FONT FONT8X8
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;
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TERMENABLE .SET TRUE ; INCLUDE TERMINAL PSEUDODEVICE DRIVER
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;
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; TMS_IODELAY IS USED TO ADD RECOVERY TIME TO TMS9918 ACCESSES
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; IF YOU SEE SCREEN CORRUPTION, ADJUST THIS!!!
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;
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#IF (TMSMODE == TMSMODE_N8)
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; BELOW WAS TUNED FOR N8 AT 18MHZ
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#DEFINE TMS_IODELAY EX (SP),HL \ EX (SP),HL ; 38 W/S
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#ELSE
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; BELOW WAS TUNED FOR SBC AT 8MHZ
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#DEFINE TMS_IODELAY NOP \ NOP ; 8 W/S
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#ENDIF
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;
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;======================================================================
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; TMS DRIVER - INITIALIZATION
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;======================================================================
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;
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TMS_INIT:
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#IF (CPUFAM == CPU_Z180)
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CALL TMS_Z180IO
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#ENDIF
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;
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#IF (TMSMODE == TMSMODE_SCG)
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LD A,$FF
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OUT (TMS_ACR),A ; INIT AUX CONTROL REG
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#ENDIF
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;
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LD IY,TMS_IDAT ; POINTER TO INSTANCE DATA
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;
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CALL NEWLINE ; FORMATTING
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PRTS("TMS: IO=0x$")
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LD A,TMS_DATREG
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CALL PRTHEXBYTE
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CALL TMS_PROBE ; CHECK FOR HW EXISTENCE
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JR Z,TMS_INIT1 ; CONTINUE IF PRESENT
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;
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; HARDWARE NOT PRESENT
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PRTS(" NOT PRESENT$")
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OR $FF ; SIGNAL FAILURE
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RET
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;
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TMS_INIT1:
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CALL TMS_CRTINIT ; SETUP THE TMS CHIP REGISTERS
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CALL TMS_LOADFONT ; LOAD FONT DATA FROM ROM TO TMS STRORAGE
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CALL TMS_VDARES1
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#IF (TMSMODE == TMSMODE_N8)
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CALL PPK_INIT ; INITIALIZE KEYBOARD DRIVER
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#ENDIF
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#IF (INTMODE == 1 & TMSTIMENABLE)
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; ADD IM1 INT CALL LIST ENTRY
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LD HL, TMS_TSTINT ; GET INT VECTOR
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CALL HB_ADDIM1 ; ADD TO IM1 CALL LIST
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LD A, (TMS_INIT9918_REG_1)
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SET TMSINTEN, A ; SET INTERRUPT ENABLE BIT
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LD (TMS_INIT9918_REG_1), A
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LD C, TMSCTRL1
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CALL TMS_SET
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#ENDIF
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;
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; ADD OURSELVES TO VDA DISPATCH TABLE
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LD BC,TMS_FNTBL ; BC := FUNCTION TABLE ADDRESS
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LD DE,TMS_IDAT ; DE := TMS INSTANCE DATA PTR
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CALL VDA_ADDENT ; ADD ENTRY, A := UNIT ASSIGNED
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;
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; INITIALIZE EMULATION
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LD C,A ; C := ASSIGNED VIDEO DEVICE NUM
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LD DE,TMS_FNTBL ; DE := FUNCTION TABLE ADDRESS
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LD HL,TMS_IDAT ; HL := TMS INSTANCE DATA PTR
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CALL TERM_ATTACH ; DO IT
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;
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XOR A ; SIGNAL SUCCESS
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RET
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#IFDEF APPBOOT
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#IF TMSTIMENABLE
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; SPECIAL CASE FOR APPBOOT - NEEDING TO DISABLE INTERRUPT GENERATOR
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; ISSUE:
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; IF THE CURRENT ROMBOOT HAD LOADED THE TMS DRIVER
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; THEN THE ROMLOADER MAY START RECEIVING INTERRUPTS
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; FROM THE CHIP BEFORE THE TMS DRIVER HAS BEEN RE-
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; INITALISED, AND CAUSING BAD INT PANICS
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TMS_INT_DIS:
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LD A, (TMS_INIT9918_REG_1)
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RES TMSINTEN, A ; RESET INTERRUPT ENABLE BIT
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LD (TMS_INIT9918_REG_1), A
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LD C, TMSCTRL1
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JP TMS_SET
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#ENDIF
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#ENDIF
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;
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;======================================================================
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; TMS DRIVER - VIDEO DISPLAY ADAPTER (VDA) FUNCTIONS
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;======================================================================
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;
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TMS_FNTBL:
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.DW TMS_VDAINI
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.DW TMS_VDAQRY
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.DW TMS_VDARES
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.DW TMS_VDADEV
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.DW TMS_VDASCS
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.DW TMS_VDASCP
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.DW TMS_VDASAT
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.DW TMS_VDASCO
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.DW TMS_VDAWRC
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.DW TMS_VDAFIL
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.DW TMS_VDACPY
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.DW TMS_VDASCR
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#IF (TMSMODE == TMSMODE_N8)
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.DW PPK_STAT
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.DW PPK_FLUSH
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.DW PPK_READ
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#ELSE
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.DW TMS_STAT
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.DW TMS_FLUSH
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.DW TMS_READ
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#ENDIF
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#IF (($ - TMS_FNTBL) != (VDA_FNCNT * 2))
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.ECHO "*** INVALID TMS FUNCTION TABLE ***\n"
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FAIL
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#ENDIF
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TMS_VDAINI:
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; RESET VDA
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; CURRENTLY IGNORES VIDEO MODE AND BITMAP DATA
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CALL TMS_VDARES ; RESET VDA
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XOR A ; SIGNAL SUCCESS
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RET
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TMS_VDAQRY:
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LD C,$00 ; MODE ZERO IS ALL WE KNOW
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LD D,TMS_ROWS ; ROWS
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LD E,TMS_COLS ; COLS
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LD HL,0 ; EXTRACTION OF CURRENT BITMAP DATA NOT SUPPORTED YET
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XOR A ; SIGNAL SUCCESS
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RET
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TMS_VDARES:
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#IF (CPUFAM == CPU_Z180)
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CALL TMS_Z180IO
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#ENDIF
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TMS_VDARES1: ; ENTRY POINT TO AVOID TMS_Z180IO RECURSION
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LD DE,0 ; ROW = 0, COL = 0
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CALL TMS_XY ; SEND CURSOR TO TOP LEFT
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LD A,' ' ; BLANK THE SCREEN
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LD DE,TMS_ROWS * TMS_COLS ; FILL ENTIRE BUFFER
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CALL TMS_FILL ; DO IT
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LD DE,0 ; ROW = 0, COL = 0
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CALL TMS_XY ; SEND CURSOR TO TOP LEFT
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XOR A
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DEC A
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LD (TMS_CURSAV),A
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CALL TMS_SETCUR ; SET CURSOR
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XOR A ; SIGNAL SUCCESS
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RET
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TMS_VDADEV:
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LD D,VDADEV_TMS ; D := DEVICE TYPE
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LD E,0 ; E := PHYSICAL UNIT IS ALWAYS ZERO
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XOR A ; SIGNAL SUCCESS
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RET
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TMS_VDASCS:
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CALL PANIC ; NOT IMPLEMENTED (YET)
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TMS_VDASCP:
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#IF (CPUFAM == CPU_Z180)
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CALL TMS_Z180IO
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#ENDIF
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CALL TMS_CLRCUR
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CALL TMS_XY ; SET CURSOR POSITION
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CALL TMS_SETCUR
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XOR A ; SIGNAL SUCCESS
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RET
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TMS_VDASAT:
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XOR A ; NOT POSSIBLE, JUST SIGNAL SUCCESS
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RET
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TMS_VDASCO:
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XOR A ; NOT POSSIBLE, JUST SIGNAL SUCCESS
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RET
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TMS_VDAWRC:
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#IF (CPUFAM == CPU_Z180)
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CALL TMS_Z180IO
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#ENDIF
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CALL TMS_CLRCUR ; CURSOR OFF
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LD A,E ; CHARACTER TO WRITE GOES IN A
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CALL TMS_PUTCHAR ; PUT IT ON THE SCREEN
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CALL TMS_SETCUR
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XOR A ; SIGNAL SUCCESS
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RET
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TMS_VDAFIL:
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#IF (CPUFAM == CPU_Z180)
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CALL TMS_Z180IO
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#ENDIF
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CALL TMS_CLRCUR
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LD A,E ; FILL CHARACTER GOES IN A
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EX DE,HL ; FILL LENGTH GOES IN DE
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CALL TMS_FILL ; DO THE FILL
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CALL TMS_SETCUR
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XOR A ; SIGNAL SUCCESS
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RET
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TMS_VDACPY:
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#IF (CPUFAM == CPU_Z180)
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CALL TMS_Z180IO
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#ENDIF
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CALL TMS_CLRCUR
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; LENGTH IN HL, SOURCE ROW/COL IN DE, DEST IS TMS_POS
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; BLKCPY USES: HL=SOURCE, DE=DEST, BC=COUNT
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PUSH HL ; SAVE LENGTH
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CALL TMS_XY2IDX ; ROW/COL IN DE -> SOURCE ADR IN HL
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POP BC ; RECOVER LENGTH IN BC
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LD DE,(TMS_POS) ; PUT DEST IN DE
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CALL TMS_BLKCPY ; DO A BLOCK COPY
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CALL TMS_SETCUR
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XOR A
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RET
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TMS_VDASCR:
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#IF (CPUFAM == CPU_Z180)
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CALL TMS_Z180IO
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#ENDIF
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CALL TMS_CLRCUR
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TMS_VDASCR0:
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LD A,E ; LOAD E INTO A
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OR A ; SET FLAGS
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JR Z,TMS_VDASCR2 ; IF ZERO, WE ARE DONE
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PUSH DE ; SAVE E
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JP M,TMS_VDASCR1 ; E IS NEGATIVE, REVERSE SCROLL
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CALL TMS_SCROLL ; SCROLL FORWARD ONE LINE
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POP DE ; RECOVER E
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DEC E ; DECREMENT IT
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JR TMS_VDASCR0 ; LOOP
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TMS_VDASCR1:
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CALL TMS_RSCROLL ; SCROLL REVERSE ONE LINE
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POP DE ; RECOVER E
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INC E ; INCREMENT IT
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JR TMS_VDASCR0 ; LOOP
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TMS_VDASCR2:
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CALL TMS_SETCUR
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XOR A
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RET
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; DUMMY FUNCTIONS BELOW BECAUSE SCG BOARD HAS NO
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; KEYBOARD INTERFACE
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TMS_STAT:
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XOR A ; SIGNAL NOTHING READY
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JP CIO_IDLE ; DO IDLE PROCESSING
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TMS_FLUSH:
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XOR A ; SIGNAL SUCCESS
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RET
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TMS_READ:
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LD E,26 ; RETURN <SUB> (CTRL-Z)
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XOR A ; SIGNAL SUCCESS
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RET
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;
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;======================================================================
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; TMS DRIVER - PRIVATE DRIVER FUNCTIONS
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;======================================================================
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;
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;----------------------------------------------------------------------
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; SET TMS9918 REGISTER VALUE
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; TMS_SET WRITES VALUE IN A TO VDU REGISTER SPECIFIED IN C
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;----------------------------------------------------------------------
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;
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TMS_SET:
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OUT (TMS_CMDREG),A ; WRITE IT
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TMS_IODELAY
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LD A,C ; GET THE DESIRED REGISTER
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OR $80 ; SET BIT 7
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OUT (TMS_CMDREG),A ; SELECT THE DESIRED REGISTER
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TMS_IODELAY
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RET
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;
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;----------------------------------------------------------------------
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; SET TMS9918 READ/WRITE ADDRESS
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; TMS_WR SETS TMS9918 TO BEGIN WRITING TO ADDRESS SPECIFIED IN HL
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; TMS_RD SETS TMS9918 TO BEGIN READING TO ADDRESS SPECIFIED IN HL
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;----------------------------------------------------------------------
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;
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TMS_WR:
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PUSH HL
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SET 6,H ; SET WRITE BIT
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CALL TMS_RD
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POP HL
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RET
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;
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TMS_RD:
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LD A,L
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OUT (TMS_CMDREG),A
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TMS_IODELAY
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LD A,H
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OUT (TMS_CMDREG),A
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TMS_IODELAY
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RET
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;
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;----------------------------------------------------------------------
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; PROBE FOR TMS HARDWARE
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;----------------------------------------------------------------------
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;
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; ON RETURN, ZF SET INDICATES HARDWARE FOUND
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;
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TMS_PROBE:
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; SET WRITE ADDRESS TO $0
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LD HL,0
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CALL TMS_WR
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; WRITE TEST PATTERN TO FIRST TWO BYTES
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LD A,$A5 ; FIRST BYTE
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OUT (TMS_DATREG),A ; OUTPUT
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TMS_IODELAY ; DELAY
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CPL ; COMPLEMENT ACCUM
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OUT (TMS_DATREG),A ; SECOND BYTE
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TMS_IODELAY ; DELAY
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; SET READ ADDRESS TO $0
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LD HL,0
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CALL TMS_RD
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; READ TEST PATTERN
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LD C,$A5 ; VALUE TO EXPECT
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IN A,(TMS_DATREG) ; READ FIRST BYTE
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TMS_IODELAY ; DELAY
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CP C ; COMPARE
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RET NZ ; RETURN ON MISCOMPARE
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IN A,(TMS_DATREG) ; READ SECOND BYTE
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TMS_IODELAY ; DELAY
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CPL ; COMPLEMENT IT
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CP C ; COMPARE
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RET ; RETURN WITH RESULT IN Z
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;
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;----------------------------------------------------------------------
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; TMS9918 DISPLAY CONTROLLER CHIP INITIALIZATION
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;----------------------------------------------------------------------
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;
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TMS_CRTINIT:
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; SET WRITE ADDRESS TO $0
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LD HL,0
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CALL TMS_WR
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;
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; FILL ENTIRE RAM CONTENTS
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LD DE,$4000
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TMS_CRTINIT1:
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XOR A
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OUT (TMS_DATREG),A
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TMS_IODELAY ; DELAY
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DEC DE
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LD A,D
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OR E
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JR NZ,TMS_CRTINIT1
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;
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; INITIALIZE VDU REGISTERS
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LD C,0 ; START WITH REGISTER 0
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LD B,TMS_INIT9918LEN ; NUMBER OF REGISTERS TO INIT
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LD HL,TMS_INIT9918 ; HL = POINTER TO THE DEFAULT VALUES
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TMS_CRTINIT2:
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LD A,(HL) ; GET VALUE
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CALL TMS_SET ; WRITE IT
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INC HL ; POINT TO NEXT VALUE
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INC C ; POINT TO NEXT REGISTER
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DJNZ TMS_CRTINIT2 ; LOOP
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RET
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;
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;----------------------------------------------------------------------
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; LOAD FONT DATA
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;----------------------------------------------------------------------
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;
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TMS_LOADFONT:
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; SET WRITE ADDRESS TO $800
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LD HL,$800
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CALL TMS_WR
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#IF USELZSA2
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LD (TMS_STACK),SP ; SAVE STACK
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LD HL,(TMS_STACK) ; AND SHIFT IT
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LD DE,$2000 ; DOWN 4KB TO
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CCF ; CREATE A
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SBC HL,DE ; DECOMPRESSION BUFFER
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LD SP,HL ; HL POINTS TO BUFFER
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EX DE,HL ; START OF STACK BUFFER
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PUSH DE ; SAVE IT
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LD HL,TMS_FONT ; START OF FONT DATA
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CALL DLZSA2 ; DECOMPRESS TO DE
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POP HL ; RECALL STACK BUFFER POSITION
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#ELSE
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LD HL,TMS_FONT ; START OF FONT DATA
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#ENDIF
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;
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; FILL $800 BYTES FROM FONTDATA
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LD DE,$800
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TMS_LOADFONT1:
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LD A,(HL)
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OUT (TMS_DATREG),A
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TMS_IODELAY ; DELAY
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INC HL
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DEC DE
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LD A,D
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OR E
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JR NZ,TMS_LOADFONT1
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;
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#IF USELZSA2
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LD HL,(TMS_STACK) ; ERASE DECOMPRESS BUFFER
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LD SP,HL ; BY RESTORING THE STACK
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RET ; DONE
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TMS_STACK .DW 0
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#ELSE
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RET
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#ENDIF
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;
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;----------------------------------------------------------------------
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; VIRTUAL CURSOR MANAGEMENT
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; TMS_SETCUR CONFIGURES AND DISPLAYS CURSOR AT CURRENT CURSOR LOCATION
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; TMS_CLRCUR REMOVES THE CURSOR
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;
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; VIRTUAL CURSOR IS GENERATED BY DYNAMICALLY CHANGING FONT GLYPH
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; FOR CHAR 255 TO BE THE INVERSE OF THE GLYPH OF THE CHARACTER UNDER
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; THE CURRENT CURSOR POSITION. THE CHARACTER CODE IS THEN SWITCH TO
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; THE VALUE 255 AND THE ORIGINAL VALUE IS SAVED. WHEN THE DISPLAY
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; NEEDS TO BE CHANGED THE PROCESS IS UNDONE. IT IS ESSENTIAL THAT
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; ALL DISPLAY CHANGES BE BRACKETED WITH CALLS TO TMS_CLRCUR PRIOR TO
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; CHANGES AND TMS_SETCUR AFTER CHANGES.
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;----------------------------------------------------------------------
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;
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TMS_SETCUR:
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PUSH HL ; PRESERVE HL
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PUSH DE ; PRESERVE DE
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LD HL,(TMS_POS) ; GET CURSOR POSITION
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CALL TMS_RD ; SETUP TO READ VDU BUF
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IN A,(TMS_DATREG) ; GET REAL CHAR UNDER CURSOR
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TMS_IODELAY ; DELAY
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PUSH AF ; SAVE THE CHARACTER
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CALL TMS_WR ; SETUP TO WRITE TO THE SAME PLACE
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LD A,$FF ; REPLACE REAL CHAR WITH 255
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OUT (TMS_DATREG),A ; DO IT
|
|
TMS_IODELAY ; DELAY
|
|
POP AF ; RECOVER THE REAL CHARACTER
|
|
LD B,A ; PUT IT IN B
|
|
LD A,(TMS_CURSAV) ; GET THE CURRENTLY SAVED CHAR
|
|
CP B ; COMPARE TO CURRENT
|
|
JR Z,TMS_SETCUR3 ; IF EQUAL, BYPASS EXTRA WORK
|
|
LD A,B ; GET REAL CHAR BACK TO A
|
|
LD (TMS_CURSAV),A ; SAVE IT
|
|
; GET THE GLYPH DATA FOR REAL CHARACTER
|
|
LD HL,0 ; ZERO HL
|
|
LD L,A ; HL IS NOW RAW CHAR INDEX
|
|
LD B,3 ; LEFT SHIFT BY 3 BITS
|
|
TMS_SETCUR0: ; MULT BY 8 FOR FONT INDEX
|
|
SLA L ; SHIFT LSB INTO CARRY
|
|
RL H ; SHFT MSB FROM CARRY
|
|
DJNZ TMS_SETCUR0 ; LOOP 3 TIMES
|
|
LD DE,$800 ; OFFSET TO START OF FONT TABLE
|
|
ADD HL,DE ; ADD TO FONT INDEX
|
|
CALL TMS_RD ; SETUP TO READ GLYPH
|
|
LD B,8 ; 8 BYTES
|
|
LD HL,TMS_BUF ; INTO BUFFER
|
|
TMS_SETCUR1: ; READ GLYPH LOOP
|
|
IN A,(TMS_DATREG) ; GET NEXT BYTE
|
|
TMS_IODELAY ; IO DELAY
|
|
LD (HL),A ; SAVE VALUE IN BUF
|
|
INC HL ; BUMP BUF POINTER
|
|
DJNZ TMS_SETCUR1 ; LOOP FOR 8 BYTES
|
|
;
|
|
; NOW WRITE INVERTED GLYPH INTO FONT INDEX 255
|
|
LD HL,$800 + (255 * 8) ; LOC OF GLPYPH DATA FOR CHAR 255
|
|
CALL TMS_WR ; SETUP TO WRITE THE INVERTED GLYPH
|
|
LD B,8 ; 8 BYTES PER GLYPH
|
|
LD HL,TMS_BUF ; POINT TO BUFFER
|
|
TMS_SETCUR2: ; WRITE INVERTED GLYPH LOOP
|
|
LD A,(HL) ; GET THE BYTE
|
|
INC HL ; BUMP THE BUF POINTER
|
|
XOR $FF ; INVERT THE VALUE
|
|
OUT (TMS_DATREG),A ; WRITE IT TO VDU
|
|
TMS_IODELAY ; IO DELAY
|
|
DJNZ TMS_SETCUR2 ; LOOP FOR ALL 8 BYTES OF GLYPH
|
|
;
|
|
TMS_SETCUR3: ; RESTORE REGISTERS AND RETURN
|
|
POP DE ; RECOVER DE
|
|
POP HL ; RECOVER HL
|
|
RET ; RETURN
|
|
;
|
|
;
|
|
;
|
|
TMS_CLRCUR: ; REMOVE VIRTUAL CURSOR FROM SCREEN
|
|
PUSH HL ; SAVE HL
|
|
LD HL,(TMS_POS) ; POINT TO CURRENT CURSOR POS
|
|
CALL TMS_WR ; SET UP TO WRITE TO VDU
|
|
LD A,(TMS_CURSAV) ; GET THE REAL CHARACTER
|
|
OUT (TMS_DATREG),A ; WRITE IT
|
|
TMS_IODELAY ; IO DELAY
|
|
POP HL ; RECOVER HL
|
|
RET ; RETURN
|
|
;
|
|
;----------------------------------------------------------------------
|
|
; SET CURSOR POSITION TO ROW IN D AND COLUMN IN E
|
|
;----------------------------------------------------------------------
|
|
;
|
|
TMS_XY:
|
|
CALL TMS_XY2IDX ; CONVERT ROW/COL TO BUF IDX
|
|
LD (TMS_POS),HL ; SAVE THE RESULT (DISPLAY POSITION)
|
|
RET
|
|
;
|
|
;----------------------------------------------------------------------
|
|
; CONVERT XY COORDINATES IN DE INTO LINEAR INDEX IN HL
|
|
; D=ROW, E=COL
|
|
;----------------------------------------------------------------------
|
|
;
|
|
TMS_XY2IDX:
|
|
LD A,E ; SAVE COLUMN NUMBER IN A
|
|
LD H,D ; SET H TO ROW NUMBER
|
|
LD E,TMS_COLS ; SET E TO ROW LENGTH
|
|
CALL MULT8 ; MULTIPLY TO GET ROW OFFSET
|
|
LD E,A ; GET COLUMN BACK
|
|
ADD HL,DE ; ADD IT IN
|
|
RET ; RETURN
|
|
;
|
|
;----------------------------------------------------------------------
|
|
; WRITE VALUE IN A TO CURRENT VDU BUFFER POSTION, ADVANCE CURSOR
|
|
;----------------------------------------------------------------------
|
|
;
|
|
TMS_PUTCHAR:
|
|
PUSH AF ; SAVE CHARACTER
|
|
LD HL,(TMS_POS) ; LOAD CURRENT POSITION INTO HL
|
|
CALL TMS_WR ; SET THE WRITE ADDRESS
|
|
POP AF ; RECOVER CHARACTER TO WRITE
|
|
OUT (TMS_DATREG),A ; WRITE THE CHARACTER
|
|
LD HL,(TMS_POS) ; LOAD CURRENT POSITION INTO HL
|
|
INC HL
|
|
LD (TMS_POS),HL
|
|
RET
|
|
;
|
|
;----------------------------------------------------------------------
|
|
; FILL AREA IN BUFFER WITH SPECIFIED CHARACTER AND CURRENT COLOR/ATTRIBUTE
|
|
; STARTING AT THE CURRENT FRAME BUFFER POSITION
|
|
; A: FILL CHARACTER
|
|
; DE: NUMBER OF CHARACTERS TO FILL
|
|
;----------------------------------------------------------------------
|
|
;
|
|
TMS_FILL:
|
|
LD C,A ; SAVE THE CHARACTER TO WRITE
|
|
LD HL,(TMS_POS) ; SET STARTING POSITION
|
|
CALL TMS_WR ; SET UP FOR WRITE
|
|
;
|
|
TMS_FILL1:
|
|
LD A,C ; RECOVER CHARACTER TO WRITE
|
|
OUT (TMS_DATREG),A
|
|
TMS_IODELAY
|
|
DEC DE
|
|
LD A,D
|
|
OR E
|
|
JR NZ,TMS_FILL1
|
|
;
|
|
RET
|
|
;
|
|
;----------------------------------------------------------------------
|
|
; SCROLL ENTIRE SCREEN FORWARD BY ONE LINE (CURSOR POSITION UNCHANGED)
|
|
;----------------------------------------------------------------------
|
|
;
|
|
TMS_SCROLL:
|
|
LD HL,0 ; SOURCE ADDRESS OF CHARACER BUFFER
|
|
LD C,TMS_ROWS - 1 ; SET UP LOOP COUNTER FOR ROWS - 1
|
|
;
|
|
TMS_SCROLL0: ; READ LINE THAT IS ONE PAST CURRENT DESTINATION
|
|
PUSH HL ; SAVE CURRENT DESTINATION
|
|
LD DE,TMS_COLS
|
|
ADD HL,DE ; POINT TO NEXT ROW SOURCE
|
|
CALL TMS_RD ; SET UP TO READ
|
|
LD DE,TMS_BUF
|
|
LD B,TMS_COLS
|
|
TMS_SCROLL1:
|
|
IN A,(TMS_DATREG)
|
|
TMS_IODELAY
|
|
LD (DE),A
|
|
INC DE
|
|
DJNZ TMS_SCROLL1
|
|
POP HL ; RECOVER THE DESTINATION
|
|
;
|
|
; WRITE THE BUFFERED LINE TO CURRENT DESTINATION
|
|
CALL TMS_WR ; SET UP TO WRITE
|
|
LD DE,TMS_BUF
|
|
LD B,TMS_COLS
|
|
TMS_SCROLL2:
|
|
LD A,(DE)
|
|
OUT (TMS_DATREG),A
|
|
TMS_IODELAY
|
|
INC DE
|
|
DJNZ TMS_SCROLL2
|
|
;
|
|
; BUMP TO NEXT LINE
|
|
LD DE,TMS_COLS
|
|
ADD HL,DE
|
|
DEC C ; DECREMENT ROW COUNTER
|
|
JR NZ,TMS_SCROLL0 ; LOOP THRU ALL ROWS
|
|
;
|
|
; FILL THE NEWLY EXPOSED BOTTOM LINE
|
|
CALL TMS_WR
|
|
LD A,' '
|
|
LD B,TMS_COLS
|
|
TMS_SCROLL3:
|
|
OUT (TMS_DATREG),A
|
|
TMS_IODELAY
|
|
DJNZ TMS_SCROLL3
|
|
;
|
|
RET
|
|
;
|
|
;----------------------------------------------------------------------
|
|
; REVERSE SCROLL ENTIRE SCREEN BY ONE LINE (CURSOR POSITION UNCHANGED)
|
|
;----------------------------------------------------------------------
|
|
;
|
|
TMS_RSCROLL:
|
|
LD HL,TMS_COLS * (TMS_ROWS - 1)
|
|
LD C,TMS_ROWS - 1
|
|
;
|
|
TMS_RSCROLL0: ; READ THE LINE THAT IS ONE PRIOR TO CURRENT DESTINATION
|
|
PUSH HL ; SAVE THE DESTINATION ADDRESS
|
|
LD DE,-TMS_COLS
|
|
ADD HL,DE ; SET SOURCE ADDRESS
|
|
CALL TMS_RD ; SET UP TO READ
|
|
LD DE,TMS_BUF ; POINT TO BUFFER
|
|
LD B,TMS_COLS ; LOOP FOR EACH COLUMN
|
|
TMS_RSCROLL1:
|
|
IN A,(TMS_DATREG) ; GET THE CHAR
|
|
TMS_IODELAY ; RECOVER
|
|
LD (DE),A ; SAVE IN BUFFER
|
|
INC DE ; BUMP BUFFER POINTER
|
|
DJNZ TMS_RSCROLL1 ; LOOP THRU ALL COLS
|
|
POP HL ; RECOVER THE DESTINATION ADDRESS
|
|
;
|
|
; WRITE THE BUFFERED LINE TO CURRENT DESTINATION
|
|
CALL TMS_WR ; SET THE WRITE ADDRESS
|
|
LD DE,TMS_BUF ; POINT TO BUFFER
|
|
LD B,TMS_COLS ; INIT LOOP COUNTER
|
|
TMS_RSCROLL2:
|
|
LD A,(DE) ; LOAD THE CHAR
|
|
OUT (TMS_DATREG),A ; WRITE TO SCREEN
|
|
TMS_IODELAY ; DELAY
|
|
INC DE ; BUMP BUF POINTER
|
|
DJNZ TMS_RSCROLL2 ; LOOP THRU ALL COLS
|
|
;
|
|
; BUMP TO THE PRIOR LINE
|
|
LD DE,-TMS_COLS ; LOAD COLS (NEGATIVE)
|
|
ADD HL,DE ; BACK UP THE ADDRESS
|
|
DEC C ; DECREMENT ROW COUNTER
|
|
JR NZ,TMS_RSCROLL0 ; LOOP THRU ALL ROWS
|
|
;
|
|
; FILL THE NEWLY EXPOSED BOTTOM LINE
|
|
CALL TMS_WR
|
|
LD A,' '
|
|
LD B,TMS_COLS
|
|
TMS_RSCROLL3:
|
|
OUT (TMS_DATREG),A
|
|
TMS_IODELAY
|
|
DJNZ TMS_RSCROLL3
|
|
;
|
|
RET
|
|
;
|
|
;----------------------------------------------------------------------
|
|
; BLOCK COPY BC BYTES FROM HL TO DE
|
|
;----------------------------------------------------------------------
|
|
;
|
|
TMS_BLKCPY:
|
|
; SAVE DESTINATION AND LENGTH
|
|
PUSH BC ; LENGTH
|
|
PUSH DE ; DEST
|
|
;
|
|
; READ FROM THE SOURCE LOCATION
|
|
TMS_BLKCPY1:
|
|
CALL TMS_RD ; SET UP TO READ FROM ADDRESS IN HL
|
|
LD DE,TMS_BUF ; POINT TO BUFFER
|
|
LD B,C
|
|
TMS_BLKCPY2:
|
|
IN A,(TMS_DATREG) ; GET THE NEXT BYTE
|
|
TMS_IODELAY ; DELAY
|
|
LD (DE),A ; SAVE IN BUFFER
|
|
INC DE ; BUMP BUF PTR
|
|
DJNZ TMS_BLKCPY2 ; LOOP AS NEEDED
|
|
;
|
|
; WRITE TO THE DESTINATION LOCATION
|
|
POP HL ; RECOVER DESTINATION INTO HL
|
|
CALL TMS_WR ; SET UP TO WRITE
|
|
LD DE,TMS_BUF ; POINT TO BUFFER
|
|
POP BC ; GET LOOP COUNTER BACK
|
|
LD B,C
|
|
TMS_BLKCPY3:
|
|
LD A,(DE) ; GET THE CHAR FROM BUFFER
|
|
OUT (TMS_DATREG),A ; WRITE TO VDU
|
|
TMS_IODELAY ; DELAY
|
|
INC DE ; BUMP BUF PTR
|
|
DJNZ TMS_BLKCPY3 ; LOOP AS NEEDED
|
|
;
|
|
RET
|
|
;
|
|
;----------------------------------------------------------------------
|
|
; Z180 LOW SPEED I/O CODE BRACKETING
|
|
;----------------------------------------------------------------------
|
|
;
|
|
#IF (CPUFAM == CPU_Z180)
|
|
;
|
|
TMS_Z180IO:
|
|
; HOOK CALLERS RETURN TO RESTORE DCNTL
|
|
EX (SP),HL ; SAVE HL & HL := RET ADR
|
|
LD (TMS_Z180IOR),HL ; SET RET ADR
|
|
LD HL,TMS_Z180IOX ; HL := SPECIAL RETURN ADR
|
|
EX (SP),HL ; RESTORE HL, INS NEW RET ADR
|
|
; SET Z180 MAX I/O WAIT STATES
|
|
PUSH AF ; SAVE AF
|
|
IN0 A,(Z180_DCNTL) ; GET CURRENT Z180 DCNTL
|
|
LD (TMS_DCNTL),A ; SAVE IT
|
|
OR %00110000 ; NEW DCNTL VALUE (MAX I/O W/S)
|
|
OUT0 (Z180_DCNTL),A ; IMPLEMENT IT
|
|
POP AF ; RESTORE AF
|
|
; BACK TO CALLER
|
|
TMS_Z180IOR .EQU $+1
|
|
JP $0000 ; BACK TO CALLER
|
|
;
|
|
TMS_Z180IOX:
|
|
; RESTORE ORIGINAL DCNTL
|
|
PUSH AF ; SAVE AF
|
|
LD A,(TMS_DCNTL) ; ORIG DCNTL
|
|
OUT0 (Z180_DCNTL),A ; IMPLEMENT IT
|
|
POP AF ; RESTORE AF
|
|
RET ; DONE
|
|
;
|
|
#ENDIF
|
|
|
|
#IF (INTMODE == 1 & TMSTIMENABLE)
|
|
TMS_TSTINT:
|
|
IN A, (TMS_CMDREG) ; TEST FOR INT FLAG
|
|
AND $80
|
|
JR NZ, TMS_INTHNDL
|
|
AND $00 ; RETURN Z - NOT HANDLED
|
|
RET
|
|
|
|
TMS_INTHNDL:
|
|
CALL HB_TIMINT ; RETURN NZ - HANDLED
|
|
OR $FF
|
|
RET
|
|
#ENDIF
|
|
;
|
|
;==================================================================================================
|
|
; TMS DRIVER - DATA
|
|
;==================================================================================================
|
|
;
|
|
TMS_POS .DW 0 ; CURRENT DISPLAY POSITION
|
|
TMS_CURSAV .DB 0 ; SAVES ORIGINAL CHARACTER UNDER CURSOR
|
|
TMS_BUF .FILL 256,0 ; COPY BUFFER
|
|
;
|
|
;==================================================================================================
|
|
; TMS DRIVER - TMS9918 REGISTER INITIALIZATION
|
|
;==================================================================================================
|
|
;
|
|
; Control Registers (write CMDREG):
|
|
;
|
|
; Reg Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Description
|
|
; 0 - - - - - - M2 EXTVID
|
|
; 1 4/16K BL GINT M1 M3 - SI MAG
|
|
; 2 - - - - PN13 PN12 PN11 PN10
|
|
; 3 CT13 CT12 CT11 CT10 CT9 CT8 CT7 CT6
|
|
; 4 - - - - - PG13 PG12 PG11
|
|
; 5 - SA13 SA12 SA11 SA10 SA9 SA8 SA7
|
|
; 6 - - - - - SG13 SG12 SG11
|
|
; 7 TC3 TC2 TC1 TC0 BD3 BD2 BD1 BD0
|
|
;
|
|
; Status (read CMDREG):
|
|
;
|
|
; Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Description
|
|
; INT 5S C FS4 FS3 FS2 FS1 FS0
|
|
;
|
|
; M1,M2,M3 Select screen mode
|
|
; EXTVID Enables external video input.
|
|
; 4/16K Selects 16kB RAM if set. No effect in MSX1 system.
|
|
; BL Blank screen if reset; just backdrop. Sprite system inactive
|
|
; SI 16x16 sprites if set; 8x8 if reset
|
|
; MAG Sprites enlarged if set (sprite pixels are 2x2)
|
|
; GINT Generate interrupts if set
|
|
; PN* Address for pattern name table
|
|
; CT* Address for colour table (special meaning in M2)
|
|
; PG* Address for pattern generator table (special meaning in M2)
|
|
; SA* Address for sprite attribute table
|
|
; SG* Address for sprite generator table
|
|
; TC* Text colour (foreground)
|
|
; BD* Back drop (background). Sets the colour of the border around
|
|
; the drawable area. If it is 0, it is black (like colour 1).
|
|
; FS* Fifth sprite (first sprite that's not displayed). Only valid
|
|
; if 5S is set.
|
|
; C Sprite collision detected
|
|
; 5S Fifth sprite (not displayed) detected. Value in FS* is valid.
|
|
; INT Set at each screen update, used for interrupts.
|
|
;
|
|
TMS_INIT9918:
|
|
.DB $00 ; REG 0 - NO EXTERNAL VID
|
|
TMS_INIT9918_REG_1:
|
|
.DB $50 ; REG 1 - ENABLE SCREEN, SET MODE 1
|
|
.DB $00 ; REG 2 - PATTERN NAME TABLE := 0
|
|
.DB $00 ; REG 3 - NO COLOR TABLE
|
|
.DB $01 ; REG 4 - SET PATTERN GENERATOR TABLE TO $800
|
|
.DB $00 ; REG 5 - SPRITE ATTRIBUTE IRRELEVANT
|
|
.DB $00 ; REG 6 - NO SPRITE GENERATOR TABLE
|
|
.DB $F0 ; REG 7 - WHITE ON BLACK
|
|
;
|
|
TMS_INIT9918LEN .EQU $ - TMS_INIT9918
|
|
;
|
|
#IF (CPUFAM == CPU_Z180)
|
|
TMS_DCNTL .DB $00 ; SAVE Z180 DCNTL AS NEEDED
|
|
#ENDIF
|
|
;
|
|
;==================================================================================================
|
|
; TMS DRIVER - INSTANCE DATA
|
|
;==================================================================================================
|
|
;
|
|
TMS_IDAT:
|
|
.DB TMS_PPIA
|
|
.DB TMS_PPIB
|
|
.DB TMS_PPIC
|
|
.DB TMS_PPIX
|
|
|