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772 lines
25 KiB
772 lines
25 KiB
;======================================================================
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; COLOR VDU DRIVER FOR SBC PROJECT
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;
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; WRITTEN BY: DAN WERNER -- 11/4/2011
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; ROMWBW ADAPTATION BY: WAYNE WARTHEN -- 11/9/2012
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;======================================================================
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;
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; TODO:
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; - IMPLEMENT CONSTANTS FOR SCREEN DIMENSIONS
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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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; CVDU DRIVER - CONSTANTS
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;======================================================================
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;
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CVDU_STAT .EQU $E4 ; READ M8563 STATUS
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CVDU_REG .EQU $E4 ; SELECT M8563 REGISTER
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CVDU_DATA .EQU $EC ; READ/WRITE M8563 DATA
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;
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CVDU_ROWS .EQU 25
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CVDU_COLS .EQU 80
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;
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;======================================================================
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; CVDU DRIVER - INITIALIZATION
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;======================================================================
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;
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CVDU_INIT:
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CALL NEWLINE ; FORMATTING
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PRTS("CVDU: IO=0x$")
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LD A,CVDU_STAT
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CALL PRTHEXBYTE
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;
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PRTS(" VDURAM=$")
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CALL CVDU_CRTINIT ; SETUP THE CVDU CHIP REGISTERS
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CALL PRTDEC
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PRTS("KB$")
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CALL CVDU_LOADFONT ; LOAD FONT DATA FROM ROM TO CVDU STRORAGE
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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_CVDU ; 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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; ADD OURSELVES TO CIO DISPATCH TABLE
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;LD B,0 ; PHYSICAL UNIT IS ZERO
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;LD C,CIODEV_CVDU ; 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_CVDU ; DEVICE TYPE
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LD BC,CVDU_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 CVDU_VDAINI
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;
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;======================================================================
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; CVDU DRIVER - CHARACTER I/O (CIO) DISPATCHER AND FUNCTIONS
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;======================================================================
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;
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CVDU_DISPCIO:
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JP PANIC
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CVDU_CIODISPADR .EQU $ - 2
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;
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;======================================================================
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; CVDU DRIVER - VIDEO DISPLAY ADAPTER (VDA) DISPATCHER AND FUNCTIONS
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;======================================================================
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;
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CVDU_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,CVDU_VDAINI ; $40
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DEC A
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JP Z,CVDU_VDAQRY ; $41
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DEC A
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JP Z,CVDU_VDARES ; $42
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DEC A
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JP Z,CVDU_VDADEV ; $43
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DEC A
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JP Z,CVDU_VDASCS ; $44
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DEC A
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JP Z,CVDU_VDASCP ; $45
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DEC A
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JP Z,CVDU_VDASAT ; $46
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DEC A
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JP Z,CVDU_VDASCO ; $47
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DEC A
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JP Z,CVDU_VDAWRC ; $48
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DEC A
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JP Z,CVDU_VDAFIL ; $49
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DEC A
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JP Z,CVDU_VDACPY ; $4A
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DEC A
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JP Z,CVDU_VDASCR ; $4B
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DEC A
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JP Z,KBD_STAT ; $4C
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DEC A
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JP Z,KBD_FLUSH ; $4D
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DEC A
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JP Z,KBD_READ ; $4E
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CALL PANIC
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CVDU_VDAINI:
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; RESET VDA
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PUSH DE ; SAVE EMULATION TYPE (IN D)
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CALL CVDU_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_CVDU ; PASS OUR DEVICE TYPE IN C
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LD DE,CVDU_DISPATCH ; DISPATCH ADDRESS TO DE
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CALL EMU_INIT ; INITIALIZE EMULATION, DE := CIO DISPATCHER
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LD (CVDU_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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CVDU_VDAQRY:
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LD C,$00 ; MODE ZERO IS ALL WE KNOW
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LD D,CVDU_ROWS ; ROWS
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LD E,CVDU_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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CVDU_VDARES:
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LD A,$0E ; ATTRIBUTE IS STANDARD WHITE ON BLACK
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LD (CVDU_ATTR),A ; SAVE IT
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LD DE,0 ; ROW = 0, COL = 0
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CALL CVDU_XY ; SEND CURSOR TO TOP LEFT
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LD A,' ' ; BLANK THE SCREEN
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LD DE,$800 ; FILL ENTIRE BUFFER
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CALL CVDU_FILL ; DO IT
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LD DE,0 ; ROW = 0, COL = 0
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CALL CVDU_XY ; SEND CURSOR TO TOP LEFT
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XOR A
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RET
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CVDU_VDADEV:
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LD D,VDADEV_CVDU ; 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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CVDU_VDASCS:
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CALL PANIC ; NOT IMPLEMENTED (YET)
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CVDU_VDASCP:
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CALL CVDU_XY ; SET CURSOR POSITION
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XOR A ; SIGNAL SUCCESS
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RET
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CVDU_VDASAT:
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; INCOMING IS: -----RUB (R=REVERSE, U=UNDERLINE, B=BLINK)
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; TRANSFORM TO: -RUB----
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LD A,E ; GET THE INCOMING ATTRIBUTE
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RLCA ; TRANSLATE TO OUR DESIRED BIT
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RLCA ; "
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RLCA ; "
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RLCA ; "
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AND %01110000 ; REMOVE ANYTHING EXTRANEOUS
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LD E,A ; SAVE IT IN E
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LD A,(CVDU_ATTR) ; GET CURRENT ATTRIBUTE SETTING
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AND %10001111 ; CLEAR OUT OLD ATTRIBUTE BITS
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OR E ; STUFF IN THE NEW ONES
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LD (CVDU_ATTR),A ; AND SAVE THE RESULT
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XOR A ; SIGNAL SUCCESS
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RET
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CVDU_VDASCO:
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; INCOMING IS: IBGRIBGR (I=INTENSITY, B=BLUE, G=GREEN, R=RED)
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; TRANSFORM TO: ----RGBI (DISCARD BACKGROUND COLOR IN HIGH NIBBLE)
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XOR A ; CLEAR A
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LD B,4 ; LOOP 4 TIMES (4 BITS)
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CVDU_VDASCO1:
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RRC E ; ROTATE LOW ORDER BIT OUT OF E INTO CF
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RLA ; ROTATE CF INTO LOW ORDER BIT OF A
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DJNZ CVDU_VDASCO1 ; DO FOUR BITS OF THIS
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LD E,A ; SAVE RESULT IN E
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LD A,(CVDU_ATTR) ; GET CURRENT VALUE INTO A
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AND %11110000 ; CLEAR OUT OLD COLOR BITS
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OR E ; STUFF IN THE NEW ONES
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LD (CVDU_ATTR),A ; AND SAVE THE RESULT
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XOR A ; SIGNAL SUCCESS
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RET
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CVDU_VDAWRC:
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LD A,E ; CHARACTER TO WRITE GOES IN A
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CALL CVDU_PUTCHAR ; PUT IT ON THE SCREEN
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XOR A ; SIGNAL SUCCESS
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RET
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CVDU_VDAFIL:
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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 CVDU_FILL ; DO THE FILL
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XOR A ; SIGNAL SUCCESS
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RET
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CVDU_VDACPY:
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; LENGTH IN HL, SOURCE ROW/COL IN DE, DEST IS CVDU_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 CVDU_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,(CVDU_POS) ; PUT DEST IN DE
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JP CVDU_BLKCPY ; DO A BLOCK COPY
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CVDU_VDASCR:
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LD A,E ; LOAD E INTO A
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OR A ; SET FLAGS
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RET Z ; IF ZERO, WE ARE DONE
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PUSH DE ; SAVE E
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JP M,CVDU_VDASCR1 ; E IS NEGATIVE, REVERSE SCROLL
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CALL CVDU_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 CVDU_VDASCR ; LOOP
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CVDU_VDASCR1:
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CALL CVDU_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 CVDU_VDASCR ; LOOP
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;
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;======================================================================
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; CVDU DRIVER - PRIVATE DRIVER FUNCTIONS
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;======================================================================
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;
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;----------------------------------------------------------------------
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; UPDATE M8563 REGISTERS
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; CVDU_WR WRITES VALUE IN A TO VDU REGISTER SPECIFIED IN C
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; CVDU_WRX WRITES VALUE IN DE TO VDU REGISTER PAIR IN C, C+1
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;----------------------------------------------------------------------
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;
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CVDU_WR:
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PUSH AF ; SAVE VALUE TO WRITE
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LD A,C ; SET A TO CVDU REGISTER TO SELECT
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OUT (CVDU_REG),A ; WRITE IT TO SELECT THE REGISTER
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CVDU_WR1:
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IN A,(CVDU_STAT) ; GET CVDU STATUS
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BIT 7,A ; CHECK BIT 7
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JR Z,CVDU_WR1 ; LOOP WHILE NOT READY (BIT 7 NOT SET)
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POP AF ; RESTORE VALUE TO WRITE
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OUT (CVDU_DATA),A ; WRITE IT
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RET
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;
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CVDU_WRX:
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LD A,H ; SETUP MSB TO WRITE
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CALL CVDU_WR ; DO IT
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INC C ; NEXT CVDU REGISTER
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LD A,L ; SETUP LSB TO WRITE
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JR CVDU_WR ; DO IT & RETURN
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;
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;----------------------------------------------------------------------
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; READ M8563 REGISTERS
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; CVDU_RD READS VDU REGISTER SPECIFIED IN C AND RETURNS VALUE IN A
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; CVDU_RDX READS VDU REGISTER PAIR SPECIFIED BY C, C+1
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; AND RETURNS VALUE IN HL
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;----------------------------------------------------------------------
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;
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CVDU_RD:
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LD A,C ; SET A TO CVDU REGISTER TO SELECT
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OUT (CVDU_REG),A ; WRITE IT TO SELECT THE REGISTER
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CVDU_RD1:
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IN A,(CVDU_STAT) ; GET CVDU STATUS
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BIT 7,A ; CHECK BIT 7
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JR Z,CVDU_RD1 ; LOOP WHILE NOT READY (BIT 7 NOT SET)
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IN A,(CVDU_DATA) ; READ IT
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RET
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;
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CVDU_RDX:
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CALL CVDU_RD ; GET VALUE FROM REGISTER IN C
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LD H,A ; SAVE IN H
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INC C ; BUMP TO NEXT REGISTER OF PAIR
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CALL CVDU_RD ; READ THE VALUE
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LD L,A ; SAVE IT IN L
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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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CVDU_CRTINIT:
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LD C,0 ; START WITH REGISTER 0
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LD B,37 ; INIT 37 REGISTERS
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LD HL,CVDU_INIT8563 ; HL = POINTER TO THE DEFAULT VALUES
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CVDU_CRTINIT1:
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LD A,(HL) ; GET VALUE
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CALL CVDU_WR ; 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 CVDU_CRTINIT1 ; LOOP
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;
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; NOW DETERMINE VDU RAM SIZE DYNAMICALLY
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; ASSUMES THAT VDU RAM SIZE IS SET FOR 64KB ABOVE
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; A. WRITE ZERO TO ADDRESS $0000
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; B. WRITE NON-ZERO TO ADDRESS $0100
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; C. CHECK THE VALUE IN ADDRESS $0000; IF IT CHANGED,
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; 16K DRAM CHIPS INSTALLED; IF NOT, 64K DRAM CHIPS INSTALLED
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; IF 16KB RAM DETECTED, ADJUST VDU REGISTERS APPROPRIATELY
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;
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; WRITE $00 TO VDU RAM LOCATION $0000
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LD HL,$0000 ; POINT TO VDU RAM LOC $0000
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LD C,18 ; UPDATE ADDRESS REGISTER PAIR
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CALL CVDU_WRX ; DO IT
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XOR A ; ZERO IN ACCUM
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LD C,31 ; DATA REGISTER
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CALL CVDU_WR ; WRITE ZERO TO $0000
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; WRITE $FF TO VDU RAM LOCATION $0100
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LD HL,$0100 ; POINT TO VDU RAM LOC $0100
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LD C,18 ; UPDATE ADDRESS REGISTER PAIR
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CALL CVDU_WRX ; DO IT
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LD A,$FF ; $FF IN ACCUM
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LD C,31 ; DATA REGISTER
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CALL CVDU_WR ; WRITE ZERO TO $0100
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; READ VALUE FROM VDU RAM LOCATION $0000
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LD HL,$0000 ; POINT TO VDU RAM LOC $0000
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LD C,18 ; UPDATE ADDRESS REGISTER PAIR
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CALL CVDU_WRX ; DO IT
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LD C,31 ; DATA REGISTER
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CALL CVDU_RD ; READ VALUE AT $0000
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; CHECK VALUE, IF NOT $00, ADJUST RAM SIZE
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OR A ; SET FLAGS
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JR NZ,CVDU_CRTINIT2 ; IF NOT ZERO, ADJUST RAM SIZE
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LD HL,64 ; RETURN RAMSIZE IN HL
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RET ; 64K CHIPS USED, ALL DONE
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;
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CVDU_CRTINIT2: ; ADJUST FOR 16K RAM SIZE
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LD A,$20 ; NEW VALUE
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LD C,28 ; FOR REG 28
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CALL CVDU_WR ; DO IT
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LD HL,16 ; RETURN RAMSIZE IN HL
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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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CVDU_LOADFONT:
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LD HL,$2000 ; START OF FONT BUFFER
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LD C,18 ; UPDATE ADDRESS REGISTER PAIR
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CALL CVDU_WRX ; DO IT
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LD HL,CVDU_FONTDATA ; POINTER TO FONT DATA
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LD DE,$2000 ; LENGTH OF FONT DATA
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LD C,31 ; DATA REGISTER
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CVDU_LOADFONT1:
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LD A,(HL) ; LOAD NEXT BYTE OF FONT DATA
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CALL CVDU_WR ; WRITE IT
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INC HL ; INCREMENT FONT DATA POINTER
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DEC DE ; DECREMENT LOOP COUNTER
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LD A,D ; CHECK DE...
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OR E ; FOR COUNTER EXHAUSTED
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JR NZ,CVDU_LOADFONT1 ; LOOP TILL DONE
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RET
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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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CVDU_XY:
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CALL CVDU_XY2IDX ; CONVERT ROW/COL TO BUF IDX
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LD (CVDU_POS),HL ; SAVE THE RESULT (DISPLAY POSITION)
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LD C,14 ; CURSOR POSITION REGISTER PAIR
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JP CVDU_WRX ; DO IT AND RETURN
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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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CVDU_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,CVDU_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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CVDU_PUTCHAR:
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PUSH AF ; SAVE CHARACTER
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; SET MEMORY LOCATION FOR CHARACTER
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LD HL,(CVDU_POS) ; LOAD CURRENT POSITION INTO HL
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LD C,18 ; UPDATE ADDRESS REGISTER PAIR
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CALL CVDU_WRX ; DO IT
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; PUT THE CHARACTER THERE
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POP AF ; RECOVER CHARACTER VALLUE TO WRITE
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LD C,31 ; DATA REGISTER
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CALL CVDU_WR ; DO IT
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; BUMP THE CURSOR FORWARD
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INC HL ; BUMP HL TO NEXT POSITION
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LD (CVDU_POS),HL ; SAVE IT
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LD C,14 ; CURSOR POSITION REGISTER PAIR
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CALL CVDU_WRX ; DO IT
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; SET MEMORY LOCATION FOR ATTRIBUTE
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LD DE,$800 - 1 ; SETUP DE TO ADD OFFSET INTO ATTRIB BUFFER
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ADD HL,DE ; HL NOW POINTS TO ATTRIB POS FOR CHAR JUST WRITTEN
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LD C,18 ; UPDATE ADDRESS REGISTER PAIR
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CALL CVDU_WRX ; DO IT
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; PUT THE ATTRIBUTE THERE
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LD A,(CVDU_ATTR) ; LOAD THE ATTRIBUTE VALUE
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LD C,31 ; DATA REGISTER
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JP CVDU_WR ; DO IT AND RETURN
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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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CVDU_FILL:
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PUSH DE ; SAVE FILL COUNT
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LD HL,(CVDU_POS) ; SET CHARACTER BUFFER POSITION TO FILL
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PUSH HL ; SAVE BUF POS
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CALL CVDU_FILL1 ; DO THE CHARACTER FILL
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POP HL ; RECOVER BUF POS
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LD DE,$800 ; INCREMENT FOR ATTRIBUTE FILL
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ADD HL,DE ; HL := BUF POS FOR ATTRIBUTE FILL
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POP DE ; RECOVER FILL COUNT
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LD A,(CVDU_ATTR) ; SET ATTRIBUTE VALUE FOR ATTRIBUTE FILL
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JR CVDU_FILL1 ; DO ATTRIBUTE FILL AND RETURN
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CVDU_FILL1:
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LD B,A ; SAVE REQUESTED FILL VALUE
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; CHECK FOR VALID FILL LENGTH
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LD A,D ; LOAD D
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OR E ; OR WITH E
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RET Z ; BAIL OUT IF LENGTH OF ZERO SPECIFIED
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; POINT TO BUFFER LOCATION TO START FILL
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LD C,18 ; UPDATE ADDRESS REGISTER PAIR
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CALL CVDU_WRX ; DO IT
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; SET MODE TO BLOCK WRITE
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LD C,24 ; BLOCK MODE CONTROL REGISTER
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CALL CVDU_RD ; GET CURRENT VALUE
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AND $7F ; CLEAR BIT 7 FOR FILL MODE
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CALL CVDU_WR ; DO IT
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; SET CHARACTER TO WRITE (WRITES ONE CHARACTER)
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LD A,B ; RECOVER FILL VALUE
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LD C,31 ; DATA REGISTER
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CALL CVDU_WR ; DO IT
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DEC DE ; REFLECT ONE CHARACTER WRITTEN
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; LOOP TO DO BULK WRITE (UP TO 255 BYTES PER LOOP)
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EX DE,HL ; NOW USE HL FOR COUNT
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LD C,30 ; BYTE COUNT REGISTER
|
|
CVDU_FILL2:
|
|
LD A,H ; GET HIGH BYTE
|
|
OR A ; SET FLAGS
|
|
LD A,L ; PRESUME WE WILL WRITE L COUNT (ALL REMAINING) BYTES
|
|
JR Z,CVDU_FILL3 ; IF H WAS ZERO, WRITE L BYTES
|
|
LD A,$FF ; H WAS > 0, NEED MORE LOOPS, WRITE 255 BYTES
|
|
CVDU_FILL3:
|
|
CALL CVDU_WR ; DO IT (SOURCE/DEST REGS AUTO INCREMENT)
|
|
LD D,0 ; CLEAR D
|
|
LD E,A ; SET E TO BYTES WRITTEN
|
|
OR A ; CLEAR CARRY
|
|
SBC HL,DE ; SUBTRACT FROM HL
|
|
RET Z ; IF ZERO, WE ARE DONE
|
|
JR CVDU_FILL2 ; OTHERWISE, WRITE SOME MORE
|
|
;
|
|
;----------------------------------------------------------------------
|
|
; SCROLL ENTIRE SCREEN FORWARD BY ONE LINE (CURSOR POSITION UNCHANGED)
|
|
;----------------------------------------------------------------------
|
|
;
|
|
CVDU_SCROLL:
|
|
; SCROLL THE CHARACTER BUFFER
|
|
LD A,' ' ; CHAR VALUE TO FILL NEW EXPOSED LINE
|
|
LD HL,0 ; SOURCE ADDRESS OF CHARACER BUFFER
|
|
CALL CVDU_SCROLL1 ; SCROLL CHARACTER BUFFER
|
|
|
|
; SCROLL THE ATTRIBUTE BUFFER
|
|
LD A,(CVDU_ATTR) ; ATTRIBUTE VALUE TO FILL NEW EXPOSED LINE
|
|
LD HL,$800 ; SOURCE ADDRESS OF ATTRIBUTE BUFFER
|
|
JR CVDU_SCROLL1 ; SCROLL ATTRIBUTE BUFFER
|
|
|
|
CVDU_SCROLL1:
|
|
PUSH AF ; SAVE FILL VALUE FOR NOW
|
|
|
|
; SET MODE TO BLOCK COPY
|
|
LD C,24 ; BLOCK MODE CONTROL REGISTER
|
|
CALL CVDU_RD ; GET CURRENT VALUE
|
|
OR $80 ; SET BIT 7 FOR COPY MODE
|
|
CALL CVDU_WR ; DO IT
|
|
|
|
; SET INITIAL BLOCK COPY DESTINATION (USING HL PASSED IN)
|
|
LD C,18 ; UPDATE ADDRESS (DESTINATION) REGISTER
|
|
CALL CVDU_WRX ; DO IT
|
|
|
|
; COMPUTE SOURCE (INCREMENT ONE ROW)
|
|
LD DE,CVDU_COLS ; SOURCE ADDRESS IS ONE ROW PAST DESTINATION
|
|
ADD HL,DE ; ADD IT TO BUF ADDRESS
|
|
|
|
; SET INITIAL BLOCK COPY SOURCE
|
|
LD C,32 ; BLOCK START ADDRESS REGISTER
|
|
CALL CVDU_WRX ; DO IT
|
|
|
|
LD B,CVDU_ROWS - 1 ; ITERATIONS (ROWS - 1)
|
|
CVDU_SCROLL2:
|
|
; SET BLOCK COPY COUNT (WILL EXECUTE COPY)
|
|
LD A,CVDU_COLS ; COPY 80 BYTES
|
|
LD C,30 ; WORD COUNT REGISTER
|
|
CALL CVDU_WR ; DO IT
|
|
|
|
; LOOP TILL DONE WITH ALL LINES
|
|
DJNZ CVDU_SCROLL2 ; REPEAT FOR ALL LINES
|
|
|
|
; SET MODE TO BLOCK WRITE TO CLEAR NEW LINE EXPOSED BY SCROLL
|
|
LD C,24 ; BLOCK MODE CONTROL REGISTER
|
|
CALL CVDU_RD ; GET CURRENT VALUE
|
|
AND $7F ; CLEAR BIT 7 FOR FILL MODE
|
|
CALL CVDU_WR ; DO IT
|
|
|
|
; SET VALUE TO WRITE
|
|
POP AF ; RESTORE THE FILL VALUE PASSED IN
|
|
LD C,31 ; DATA REGISTER
|
|
CALL CVDU_WR ; DO IT
|
|
|
|
; SET BLOCK WRITE COUNT (WILL EXECUTE THE WRITE)
|
|
LD A,CVDU_COLS - 1 ; SET WRITE COUNT TO LINE LENGTH - 1 (1 CHAR ALREADY WRITTEN)
|
|
LD C,30 ; WORD COUNT REGISTER
|
|
CALL CVDU_WR ; DO IT
|
|
|
|
RET
|
|
;
|
|
;----------------------------------------------------------------------
|
|
; REVERSE SCROLL ENTIRE SCREEN BY ONE LINE (CURSOR POSITION UNCHANGED)
|
|
;----------------------------------------------------------------------
|
|
;
|
|
CVDU_RSCROLL:
|
|
; SCROLL THE CHARACTER BUFFER
|
|
LD A,' ' ; CHAR VALUE TO FILL NEW EXPOSED LINE
|
|
LD HL,$0 + ((CVDU_ROWS - 1) * CVDU_COLS) ; SOURCE ADDRESS OF CHARACER BUFFER
|
|
CALL CVDU_RSCROLL1 ; SCROLL CHARACTER BUFFER
|
|
|
|
; SCROLL THE ATTRIBUTE BUFFER
|
|
LD A,(CVDU_ATTR) ; ATTRIBUTE VALUE TO FILL NEW EXPOSED LINE
|
|
LD HL,$800 + ((CVDU_ROWS - 1) * CVDU_COLS) ; SOURCE ADDRESS OF ATTRIBUTE BUFFER
|
|
JR CVDU_RSCROLL1 ; SCROLL ATTRIBUTE BUFFER AND RETURN
|
|
|
|
CVDU_RSCROLL1:
|
|
PUSH AF ; SAVE FILL VALUE FOR NOW
|
|
|
|
; SET MODE TO BLOCK COPY
|
|
LD C,24 ; BLOCK MODE CONTROL REGISTER
|
|
CALL CVDU_RD ; GET CURRENT VALUE
|
|
OR $80 ; SET BIT 7 FOR COPY MODE
|
|
CALL CVDU_WR ; DO IT
|
|
|
|
; LOOP TO SCROLL EACH LINE WORKING FROM BOTTOM TO TOP
|
|
LD B,CVDU_ROWS - 1 ; ITERATIONS (ROWS - 1)
|
|
CVDU_RSCROLL2:
|
|
|
|
; SET BLOCK COPY DESTINATION (USING HL PASSED IN)
|
|
LD C,18 ; UPDATE ADDRESS (DESTINATION) REGISTER
|
|
CALL CVDU_WRX ; DO IT
|
|
|
|
; COMPUTE SOURCE (DECREMENT ONE ROW)
|
|
LD DE,CVDU_COLS ; SOURCE ADDRESS IS ONE ROW PAST DESTINATION
|
|
OR A ; CLEAR CARRY
|
|
SBC HL,DE ; SUBTRACT IT FROM BUF ADDRESS
|
|
|
|
; SET BLOCK COPY SOURCE
|
|
LD C,32 ; BLOCK START ADDRESS REGISTER
|
|
CALL CVDU_WRX ; DO IT
|
|
|
|
; SET BLOCK COPY COUNT (WILL EXECUTE COPY)
|
|
LD A,CVDU_COLS ; COPY 80 BYTES
|
|
LD C,30 ; WORD COUNT REGISTER
|
|
CALL CVDU_WR ; DO IT
|
|
|
|
DJNZ CVDU_RSCROLL2 ; REPEAT FOR ALL LINES
|
|
|
|
; SET FILL DESTINATION (USING HL PASSED IN)
|
|
LD C,18 ; UPDATE ADDRESS (DESTINATION) REGISTER
|
|
CALL CVDU_WRX ; DO IT
|
|
|
|
; SET MODE TO BLOCK WRITE TO CLEAR NEW LINE EXPOSED BY SCROLL
|
|
LD C,24 ; BLOCK MODE CONTROL REGISTER
|
|
CALL CVDU_RD ; GET CURRENT VALUE
|
|
AND $7F ; CLEAR BIT 7 FOR FILL MODE
|
|
CALL CVDU_WR ; DO IT
|
|
|
|
; SET VALUE TO WRITE
|
|
POP AF ; RESTORE THE FILL VALUE PASSED IN
|
|
LD C,31 ; DATA REGISTER
|
|
CALL CVDU_WR ; DO IT
|
|
|
|
; SET BLOCK WRITE COUNT (WILL EXECUTE THE WRITE)
|
|
LD A,CVDU_COLS - 1 ; SET WRITE COUNT TO LINE LENGTH - 1 (1 CHAR ALREADY WRITTEN)
|
|
LD C,30 ; WORD COUNT REGISTER
|
|
CALL CVDU_WR ; DO IT
|
|
|
|
RET
|
|
;
|
|
;----------------------------------------------------------------------
|
|
; BLOCK COPY BC BYTES FROM HL TO DE
|
|
;----------------------------------------------------------------------
|
|
;
|
|
CVDU_BLKCPY:
|
|
; SETUP PARMS FOR FIRST PASS (CHARS)
|
|
PUSH BC ; LENGTH
|
|
PUSH HL ; SOURCE
|
|
PUSH DE ; DEST
|
|
; PUT A RETURN ADDRESS ON THE STACK FOR SECOND PASS
|
|
PUSH HL ; PUT CURRENT HL ON STACK
|
|
LD HL,CVDU_BLKCPY1 ; NOW SET HL TO RETURN ADDRESS
|
|
EX (SP),HL ; GET ORIG HL BACK, AND PUT RET ADR ON STACK
|
|
; SETUP PARMS FOR SECOND PASS (ATTRIBUTES)
|
|
PUSH BC ; LENGTH
|
|
LD BC,$800 ; USE BC TO ADD OFFSET TO ATTR BUF
|
|
ADD HL,BC ; ADD THE OFFSET TO HL
|
|
PUSH HL ; SAVE PARM (SOURCE ADR)
|
|
EX DE,HL ; GET DE INTO HL
|
|
ADD HL,BC ; ADD THE OFFSET
|
|
PUSH HL ; SAVE PARM (DESTINATION ADR)
|
|
;
|
|
CVDU_BLKCPY1:
|
|
; SET MODE TO BLOCK COPY
|
|
LD C,24 ; BLOCK MODE CONTROL REGISTER
|
|
CALL CVDU_RD ; GET CURRENT VALUE
|
|
OR $80 ; SET BIT 7 FOR COPY MODE
|
|
CALL CVDU_WR ; DO IT
|
|
;
|
|
; SET DESTINATION
|
|
POP HL ; RECOVER DESTINATION ADDRESS
|
|
LD C,18 ; REGISTER = UPDATE ADDRESS
|
|
CALL CVDU_WRX ; DO IT
|
|
;
|
|
; SET SOURCE
|
|
POP HL ; RECOVER SOURCE ADDRESS
|
|
LD C,32 ; REGISTER = BLOCK START
|
|
CALL CVDU_WRX ; DO IT
|
|
;
|
|
; SET LENGTH
|
|
POP HL ; RECOVER LENGTH
|
|
LD A,L ; BYTES TO COPY GOES IN A
|
|
LD C,30 ; REGSITER = WORD COUNT
|
|
JP CVDU_WR ; DO IT (COPY OCCURS HERE) AND RETURN
|
|
;
|
|
;==================================================================================================
|
|
; CVDU DRIVER - DATA
|
|
;==================================================================================================
|
|
;
|
|
CVDU_ATTR .DB 0 ; CURRENT COLOR
|
|
CVDU_POS .DW 0 ; CURRENT DISPLAY POSITION
|
|
;
|
|
; ATTRIBUTE ENCODING:
|
|
; BIT 7: ALTERNATE CHARACTER SET
|
|
; BIT 6: REVERSE VIDEO
|
|
; BIT 5: UNDERLINE
|
|
; BIT 4: BLINK
|
|
; BIT 3: RED
|
|
; BIT 2: GREEN
|
|
; BIT 1: BLUE
|
|
; BIT 0: INTENSITY
|
|
;
|
|
;==================================================================================================
|
|
; CVDU DRIVER - 8563 REGISTER INITIALIZATION
|
|
;==================================================================================================
|
|
;
|
|
; Reg Hex Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Description
|
|
; 0 $00 HT7 HT6 HT5 HT4 HT3 HT2 HT1 HT0 Horizontal Total
|
|
; 1 $01 HD7 HD6 HD5 HD4 HD3 HD2 HD1 HD0 Horizontal Displayed
|
|
; 2 $02 HP7 HP6 HP5 HP4 HP3 HP2 HP1 HP0 Horizontal Sync Position
|
|
; 3 $03 VW3 VW2 VW1 VW0 HW3 HW2 HW1 HW0 Vertical/Horizontal Sync Width
|
|
; 4 $04 VT7 VT6 VT5 VT4 VT3 VT2 VT1 VT0 Vertical Total
|
|
; 5 $05 -- -- -- VA4 VA3 VA2 VA1 VA0 Vertical Adjust
|
|
; 6 $06 VD7 VD6 VD5 VD4 VD3 VD2 VD1 VD0 Vertical Displayed
|
|
; 7 $07 VP7 VP6 VP5 VP4 VP3 VP2 VP1 VP0 Vertical Sync Position
|
|
; 8 $08 -- -- -- -- -- -- IM1 IM0 Interlace Mode
|
|
; 9 $09 -- -- -- -- CTV4 CTV3 CTV2 CTV1 Character Total Vertical
|
|
; 10 $0A -- CM1 CM0 CS4 CS3 CS2 CS1 CS0 Cursor Mode, Start Scan
|
|
; 11 $0B -- -- -- CE4 CE3 CE2 CE1 CE0 Cursor End Scan Line
|
|
; 12 $0C DS15 DS14 DS13 DS12 DS11 DS10 DS9 DS8 Display Start Address High Byte
|
|
; 13 $0D DS7 DS6 DS5 DS4 DS3 DS2 DS1 DS0 Display Start Address Low Byte
|
|
; 14 $0E CP15 CP14 CP13 CP12 CP11 CP10 CP9 CP8 Cursor Position High Byte
|
|
; 15 $0F CP7 CP6 CP5 CP4 CP3 CP2 CP1 CP0 Cursor Position Low Byte
|
|
; 16 $10 LPV7 LPV6 LPV5 LPV4 LPV3 LPV2 LPV1 LPV0 Light Pen Vertical Position
|
|
; 17 $11 LPH7 LPH6 LPH5 LPH4 LPH3 LPH2 LPH1 LPH0 Light Pen Horizontal Position
|
|
; 18 $12 UA15 UA14 UA13 UA12 UA11 UA10 UA9 UA8 Update Address High Byte
|
|
; 19 $13 UA7 UA6 UA5 UA4 UA3 UA2 UA1 UA0 Update Address Low Byte
|
|
; 20 $14 AA15 AA14 AA13 AA12 AA11 AA10 AA9 AA8 Attribute Start Address High Byte
|
|
; 21 $15 AA7 AA6 AA5 AA4 AA3 AA2 AA1 AA0 Attribute Start Address Low Byte
|
|
; 22 $16 CTH3 CTH2 CTH1 CTH0 CDH3 CDH2 CDH1 CDH0 Character Total Horizontal, Character Display Horizontal
|
|
; 23 $17 -- -- -- CDV4 CDV3 CDV2 CDV1 CDV0 Character Display Vertical
|
|
; 24 $18 COPY RVS CBRATE VSS4 VSS3 VSS2 VSS1 VSS0 Vertical Smooth Scrolling
|
|
; 25 $19 TEXT ATR SEMI DBL HSS3 HSS2 HSS1 HSS0 Horizontal Smooth Scrolling
|
|
; 26 $1A FG3 FG2 FG1 FG0 BG3 BG2 BG1 BG0 Foreground/Background color
|
|
; 27 $1B AI7 AI6 AI5 AI4 AI3 AI2 AI1 AI0 Address Increment per Row
|
|
; 28 $1C CB15 CB14 CB13 RAM -- -- -- -- Character Base Address
|
|
; 29 $1D -- -- -- UL4 UL3 UL2 UL1 UL0 Underline Scan Line
|
|
; 30 $1E WC7 WC6 WC5 WC4 WC3 WC2 WC1 WC0 Word Count
|
|
; 31 $1F DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0 Data Register
|
|
; 32 $20 BA15 BA14 BA13 BA12 BA11 BA10 BA9 BA8 Block Start Address High Byte
|
|
; 33 $21 BA7 BA6 BA5 BA4 BA3 BA2 BA1 BA0 Block Start Address Low Byte
|
|
; 34 $22 DEB7 DEB6 DEB5 DEB4 DEB3 DEB2 DEB1 DEB0 Display Enable Begin
|
|
; 35 $23 DEE7 DEE6 DEE5 DEE4 DEE3 DEE2 DEE1 DEE0 Display Enable End
|
|
; 36 $24 -- -- -- -- DRR3 DRR2 DRR1 DRR0 DRAM Refresh Rate
|
|
;
|
|
; EGA 720X368 9-BIT CHARACTERS
|
|
; - requires 16.257Mhz oscillator frequency
|
|
;
|
|
CVDU_INIT8563:
|
|
.DB 97 ; 0: hor. total - 1
|
|
.DB 80 ; 1: hor. displayed
|
|
.DB 90 ; 2: hor. sync position 85
|
|
.DB $14 ; 3: vert/hor sync width or 0x4F -- MDA
|
|
.DB 26 ; 4: vert total
|
|
.DB 2 ; 5: vert total adjust
|
|
.DB 25 ; 6: vert. displayed
|
|
.DB 26 ; 7: vert. sync postition
|
|
.DB 0 ; 8: interlace mode
|
|
.DB 13 ; 9: char height - 1
|
|
.DB (2<<5)+12 ; 10: cursor mode, start line
|
|
.DB 13 ; 11: cursor end line
|
|
.DB 0 ; 12: display start addr hi
|
|
.DB 0 ; 13: display start addr lo
|
|
.DB 7 ; 14: cursor position hi
|
|
.DB 128 ; 15: cursor position lo
|
|
.DB 1 ; 16: light pen vertical
|
|
.DB 1 ; 17: light pen horizontal
|
|
.DB 0 ; 18: update address hi
|
|
.DB 0 ; 19: update address lo
|
|
.DB 8 ; 20: attribute start addr hi
|
|
.DB 0 ; 21: attribute start addr lo
|
|
.DB $89 ; 22: char hor size cntrl 0x78
|
|
.DB 13 ; 23: vert char pixel space - 1, increase to 13 with new font
|
|
.DB 0 ; 24: copy/fill, reverse, blink rate; vertical scroll
|
|
.DB $48 ; 25: gr/txt, color/mono, pxl-rpt, dbl-wide; horiz. scroll
|
|
.DB $E0 ; 26: fg/bg colors (monochr)
|
|
.DB 0 ; 27: row addr display incr
|
|
.DB $20+(1<<4) ; 28: char set addr; RAM size (64/16)
|
|
.DB 13 ; 29: underline position
|
|
.DB 0 ; 30: word count - 1
|
|
.DB 0 ; 31: data
|
|
.DB 0 ; 32: block copy src hi
|
|
.DB 0 ; 33: block copy src lo
|
|
.DB 6 ; 34: display enable begin
|
|
.DB 88 ; 35: display enable end
|
|
.DB 0 ; 36: refresh rate
|
|
|
|
; .DB 126,80,102,73,32,224,25,29,252,231,160,231,0,0,7,128
|
|
; .DB 18,23,15,208,8,32,120,232,32,71,240,0,47,231,79,7,15,208,125,100,245
|
|
;
|
|
;==================================================================================================
|
|
; CVDU DRIVER - FONT DATA
|
|
;==================================================================================================
|
|
;
|
|
#INCLUDE "cvdu_font.asm"
|