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679 lines
19 KiB
679 lines
19 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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TMS_CMDREG .EQU N8_BASE + $19 ; READ STATUS / WRITE REG SEL
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TMS_DATREG .EQU N8_BASE + $18 ; READ/WRITE DATA
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;
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TMS_ROWS .EQU 24
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TMS_COLS .EQU 40
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;
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; BELOW WAS TUNED FOR N8 AT 18MHZ WITH 3 IO WAIT STATES
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; WILL NEED TO BE MODIFIED FOR DIFFERENT ACCESS SPEEDS
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; IF YOU SEE SCREEN CORRUPTION, ADJUST THIS!!!
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;
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#DEFINE TMS_IODELAY NOP \ NOP \ NOP \ NOP \ NOP \ NOP
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;
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;======================================================================
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; TMS DRIVER - INITIALIZATION
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;======================================================================
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;
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TMS_INIT:
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CALL NEWLINE ; FORMATTING
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PRTS("TMS: IO=0x$")
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LD A,TMS_DATREG
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CALL PRTHEXBYTE
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;
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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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;
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; ADD OURSELVES TO VDA DISPATCH TABLE
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LD B,0 ; PHYSICAL UNIT IS ZERO
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LD C,VDADEV_TMS ; DEVICE TYPE
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LD DE,0 ; UNIT DATA BLOB ADDRESS
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CALL VDA_ADDENT ; ADD ENTRY, A := UNIT ASSIGNED
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;
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; ADD OURSELVES TO CIO DISPATCH TABLE
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;LD B,0 ; PHYSICAL UNIT IS ZERO
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;LD C,CIODEV_TMS ; DEVICE TYPE
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;LD DE,0 ; UNIT DATA BLOB ADDRESS
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LD D,0 ; PHYSICAL UNIT IS ZERO
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LD E,CIODEV_TMS ; DEVICE TYPE
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LD BC,TMS_DISPCIO ; BC := DISPATCH ADDRESS
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CALL CIO_ADDENT ; ADD ENTRY, A := UNIT ASSIGNED
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LD (HCB + HCB_CRTDEV),A ; SET OURSELVES AS THE CRT DEVICE
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LD D,VDAEMU ; DEFAULT EMULATION
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LD E,0 ; VIDEO MODE = 0
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JP TMS_VDAINI
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;
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;======================================================================
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; TMS DRIVER - CHARACTER I/O (CIO) DISPATCHER AND FUNCTIONS
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;======================================================================
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;
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TMS_DISPCIO:
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JP PANIC
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TMS_CIODISPADR .EQU $ - 2
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;
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;======================================================================
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; TMS DRIVER - VIDEO DISPLAY ADAPTER (VDA) DISPATCHER AND FUNCTIONS
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;======================================================================
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;
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TMS_DISPATCH:
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LD A,B ; GET REQUESTED FUNCTION
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AND $0F ; ISOLATE SUB-FUNCTION
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JP Z,TMS_VDAINI ; $40
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DEC A
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JP Z,TMS_VDAQRY ; $41
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DEC A
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JP Z,TMS_VDARES ; $42
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DEC A
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JP Z,TMS_VDADEV ; $43
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DEC A
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JP Z,TMS_VDASCS ; $44
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DEC A
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JP Z,TMS_VDASCP ; $45
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DEC A
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JP Z,TMS_VDASAT ; $46
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DEC A
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JP Z,TMS_VDASCO ; $47
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DEC A
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JP Z,TMS_VDAWRC ; $48
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DEC A
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JP Z,TMS_VDAFIL ; $49
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DEC A
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JP Z,TMS_VDACPY ; $4A
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DEC A
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JP Z,TMS_VDASCR ; $4B
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DEC A
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JP Z,PPK_STAT ; $4C
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DEC A
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JP Z,PPK_FLUSH ; $4D
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DEC A
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JP Z,PPK_READ ; $4E
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CALL PANIC
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TMS_VDAINI:
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; RESET VDA
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PUSH DE ; SAVE EMULATION TYPE (IN D)
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CALL TMS_VDARES ; RESET VDA
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POP DE ; RECOVER EMULATION TYPE
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; INITIALIZE EMULATION
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LD B,D ; EMULATION TYPE TO B
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LD C,CIODEV_TMS ; PASS OUR DEVICE TYPE IN C
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LD DE,TMS_DISPATCH ; DISPATCH ADDRESS TO DE
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CALL EMU_INIT ; INITIALIZE EMULATION, DE := CIO DISPATCHER
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LD (TMS_CIODISPADR),DE ; SAVE EMULATORS CIO DISPATCH INTERFACE ADDRESS
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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_VDADEV:
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LD D,VDADEV_TMS ; D := DEVICE TYPE
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LD E,C ; E := PHYSICAL UNIT
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XOR A ; SIGNAL SUCCESS
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RET
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TMS_VDARES:
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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_VDASCS:
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CALL PANIC ; NOT IMPLEMENTED (YET)
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TMS_VDASCP:
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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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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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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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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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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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;
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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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; MOS 8563 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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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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;
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; FILL $800 BYTES FROM FONTDATA
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LD HL,TMS_FONTDATA
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LD DE,$100 * 8
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TMS_LOADFONT1:
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LD B,8
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TMS_LOADFONT2:
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LD A,(HL)
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PUSH AF
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INC HL
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DJNZ TMS_LOADFONT2
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;
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LD B,8
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TMS_LOADFONT3:
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POP AF
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OUT (TMS_DATREG),A
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DEC DE
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DJNZ TMS_LOADFONT3
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;
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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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RET
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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
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TMS_IODELAY ; DELAY
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POP AF ; RECOVER THE REAL CHARACTER
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LD B,A ; PUT IT IN B
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LD A,(TMS_CURSAV) ; GET THE CURRENTLY SAVED CHAR
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CP B ; COMPARE TO CURRENT
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JR Z,TMS_SETCUR3 ; IF EQUAL, BYPASS EXTRA WORK
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LD A,B ; GET REAL CHAR BACK TO A
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LD (TMS_CURSAV),A ; SAVE IT
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; GET THE GLYPH DATA FOR REAL CHARACTER
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LD HL,0 ; ZERO HL
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LD L,A ; HL IS NOW RAW CHAR INDEX
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LD B,3 ; LEFT SHIFT BY 3 BITS
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TMS_SETCUR0: ; MULT BY 8 FOR FONT INDEX
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SLA L ; SHIFT LSB INTO CARRY
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RL H ; SHFT MSB FROM CARRY
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DJNZ TMS_SETCUR0 ; LOOP 3 TIMES
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LD DE,$800 ; OFFSET TO START OF FONT TABLE
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ADD HL,DE ; ADD TO FONT INDEX
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CALL TMS_RD ; SETUP TO READ GLYPH
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LD B,8 ; 8 BYTES
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LD HL,TMS_BUF ; INTO BUFFER
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TMS_SETCUR1: ; READ GLYPH LOOP
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IN A,(TMS_DATREG) ; GET NEXT BYTE
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TMS_IODELAY ; IO DELAY
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LD (HL),A ; SAVE VALUE IN BUF
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INC HL ; BUMP BUF POINTER
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DJNZ TMS_SETCUR1 ; LOOP FOR 8 BYTES
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;
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; NOW WRITE INVERTED GLYPH INTO FONT INDEX 255
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LD HL,$800 + (255 * 8) ; LOC OF GLPYPH DATA FOR CHAR 255
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CALL TMS_WR ; SETUP TO WRITE THE INVERTED GLYPH
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LD B,8 ; 8 BYTES PER GLYPH
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LD HL,TMS_BUF ; POINT TO BUFFER
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TMS_SETCUR2: ; WRITE INVERTED GLYPH LOOP
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LD A,(HL) ; GET THE BYTE
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INC HL ; BUMP THE BUF POINTER
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XOR $FF ; INVERT THE VALUE
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OUT (TMS_DATREG),A ; WRITE IT TO VDU
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TMS_IODELAY ; IO DELAY
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DJNZ TMS_SETCUR2 ; LOOP FOR ALL 8 BYTES OF GLYPH
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;
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TMS_SETCUR3: ; RESTORE REGISTERS AND RETURN
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POP DE ; RECOVER DE
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POP HL ; RECOVER HL
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RET ; RETURN
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;
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;
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;
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TMS_CLRCUR: ; REMOVE VIRTUAL CURSOR FROM SCREEN
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PUSH HL ; SAVE HL
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LD HL,(TMS_POS) ; POINT TO CURRENT CURSOR POS
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CALL TMS_WR ; SET UP TO WRITE TO VDU
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LD A,(TMS_CURSAV) ; GET THE REAL CHARACTER
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OUT (TMS_DATREG),A ; WRITE IT
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TMS_IODELAY ; IO DELAY
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POP HL ; RECOVER HL
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RET ; RETURN
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;
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;----------------------------------------------------------------------
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; SET CURSOR POSITION TO ROW IN D AND COLUMN IN E
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;----------------------------------------------------------------------
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;
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TMS_XY:
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CALL TMS_XY2IDX ; CONVERT ROW/COL TO BUF IDX
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LD (TMS_POS),HL ; SAVE THE RESULT (DISPLAY POSITION)
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RET
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;
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;----------------------------------------------------------------------
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; CONVERT XY COORDINATES IN DE INTO LINEAR INDEX IN HL
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; D=ROW, E=COL
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;----------------------------------------------------------------------
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;
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TMS_XY2IDX:
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LD A,E ; SAVE COLUMN NUMBER IN A
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LD H,D ; SET H TO ROW NUMBER
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LD E,TMS_COLS ; SET E TO ROW LENGTH
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CALL MULT8 ; MULTIPLY TO GET ROW OFFSET
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LD E,A ; GET COLUMN BACK
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ADD HL,DE ; ADD IT IN
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RET ; RETURN
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;
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;----------------------------------------------------------------------
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; WRITE VALUE IN A TO CURRENT VDU BUFFER POSTION, ADVANCE CURSOR
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;----------------------------------------------------------------------
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;
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TMS_PUTCHAR:
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PUSH AF ; SAVE CHARACTER
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LD HL,(TMS_POS) ; LOAD CURRENT POSITION INTO HL
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CALL TMS_WR ; SET THE WRITE ADDRESS
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POP AF ; RECOVER CHARACTER TO WRITE
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OUT (TMS_DATREG),A ; WRITE THE CHARACTER
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LD HL,(TMS_POS) ; LOAD CURRENT POSITION INTO HL
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INC HL
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LD (TMS_POS),HL
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RET
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;
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;----------------------------------------------------------------------
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; FILL AREA IN BUFFER WITH SPECIFIED CHARACTER AND CURRENT COLOR/ATTRIBUTE
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; STARTING AT THE CURRENT FRAME BUFFER POSITION
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; A: FILL CHARACTER
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; DE: NUMBER OF CHARACTERS TO FILL
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;----------------------------------------------------------------------
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;
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TMS_FILL:
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LD C,A ; SAVE THE CHARACTER TO WRITE
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LD HL,(TMS_POS) ; SET STARTING POSITION
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CALL TMS_WR ; SET UP FOR WRITE
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;
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TMS_FILL1:
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LD A,C ; RECOVER CHARACTER TO WRITE
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OUT (TMS_DATREG),A
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TMS_IODELAY
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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_FILL1
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;
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RET
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;
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;----------------------------------------------------------------------
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; SCROLL ENTIRE SCREEN FORWARD BY ONE LINE (CURSOR POSITION UNCHANGED)
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;----------------------------------------------------------------------
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;
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TMS_SCROLL:
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LD HL,0 ; SOURCE ADDRESS OF CHARACER BUFFER
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LD C,TMS_ROWS - 1 ; SET UP LOOP COUNTER FOR ROWS - 1
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;
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TMS_SCROLL0: ; READ LINE THAT IS ONE PAST CURRENT DESTINATION
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PUSH HL ; SAVE CURRENT DESTINATION
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LD DE,TMS_COLS
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ADD HL,DE ; POINT TO NEXT ROW SOURCE
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CALL TMS_RD ; SET UP TO READ
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LD DE,TMS_BUF
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LD B,TMS_COLS
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TMS_SCROLL1:
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IN A,(TMS_DATREG)
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TMS_IODELAY
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LD (DE),A
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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
|
|
;
|
|
;==================================================================================================
|
|
; 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
|
|
.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
|
|
;
|
|
;==================================================================================================
|
|
; TMS DRIVER - FONT DATA
|
|
;==================================================================================================
|
|
;
|
|
TMS_FONTDATA:
|
|
#INCLUDE "TMS_font.inc"
|