mirror of https://github.com/wwarthen/RomWBW.git
Wayne Warthen
4 years ago
20 changed files with 376 additions and 29 deletions
@ -0,0 +1,331 @@ |
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;====================================================================== |
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; UPD7220 GRAPHICS DEVICE CONTROLLER |
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;====================================================================== |
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; |
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;====================================================================== |
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; GDC DRIVER - CONSTANTS |
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;====================================================================== |
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; |
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#IF (GDCMODE == GDCMODE_ECB) |
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GDC_BASE .EQU $?? ; GDC BASE I/O PORT |
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GDC_DAC_BASE .EQU $?? ; RAMDAC BASE I/O PORT |
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#ENDIF |
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; |
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#IF (GDCMODE == GDCMODE_RPH) |
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GDC_KBDDATA .EQU $8C ; KBD CTLR DATA PORT |
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GDC_KBDST .EQU $8D ; KBD CTLR STATUS/CMD PORT |
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GDC_BASE .EQU $90 ; GDC BASE I/O PORT |
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GDC_DAC_BASE .EQU $98 ; RAMDAC BASE I/O PORT |
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#ENDIF |
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; |
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GDC_STAT .EQU GDC_BASE + 0 ; STATUS PORT |
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GDC_CMD .EQU GDC_BASE + 1 ; COMMAND PORT |
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GDC_PARAM .EQU GDC_BASE + 0 ; PARAM PORT |
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GDC_READ .EQU GDC_BASE + 1 ; READ PORT |
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GDC_DAC_WR .EQU GDC_DAC_BASE + 0 ; RAMDAC ADR WRITE |
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GDC_DAC_RD .EQU GDC_DAC_BASE + 3 ; RAMDAC ADR READ |
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GDC_DAC_PALRAM .EQU GDC_DAC_BASE + 1 ; RAMDAC PALETTE RAM |
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GDC_DAC_PIXMSK .EQU GDC_DAC_BASE + 2 ; RAMDAC PIXEL READ MASK |
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GDC_DAC_OVL_WR .EQU GDC_DAC_BASE + 4 ; RAMDAC OVERLAY WRITE |
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GDC_DAC_OVL_RD .EQU GDC_DAC_BASE + 7 ; RAMDAC OVERLAY READ |
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GDC_DAC_OVL_RAM .EQU GDC_DAC_BASE + 5 ; RAMDAC OVERLAY RAM |
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; |
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GDC_ROWS .EQU 25 |
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GDC_COLS .EQU 80 |
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; |
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; *** TODO: CGA AND EGA ARE PLACEHOLDERS. THESE EQUATES SHOULD |
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; BE USED TO ALLOW FOR MULTIPLE MONITOR TIMINGS AND/OR FONT |
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; DEFINITIONS. |
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; |
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#IF (GDCMON == GDCMON_CGA) |
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#DEFINE USEFONTCGA |
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#DEFINE GDC_FONT FONTCGA |
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#ENDIF |
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; |
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#IF (GDCMON == GDCMON_EGA) |
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#DEFINE USEFONT8X16 |
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#DEFINE GDC_FONT FONT8X16 |
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#ENDIF |
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; |
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TERMENABLE .SET TRUE ; INCLUDE TERMINAL PSEUDODEVICE DRIVER |
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; |
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;====================================================================== |
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; GDC DRIVER - INITIALIZATION |
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;====================================================================== |
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; |
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GDC_INIT: |
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LD IY,GDC_IDAT ; POINTER TO INSTANCE DATA |
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|
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CALL NEWLINE |
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PRTS("GDC: MODE=$") |
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#IF (GDCMODE == GDCMODE_ECB) |
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PRTS("ECB$") |
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#ENDIF |
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#IF (GDCMODE == GDCMODE_RPH) |
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PRTS("RPH$") |
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#ENDIF |
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; |
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#IF (GDCMON == GDCMON_CGA) |
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PRTS(" CGA$") |
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#ENDIF |
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#IF (GDCMON == GDCMON_EGA) |
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PRTS(" EGA$") |
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#ENDIF |
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; |
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PRTS(" IO=0x$") |
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LD A,GDC_BASE |
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CALL PRTHEXBYTE |
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CALL GDC_PROBE ; CHECK FOR HW PRESENCE |
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JR Z,GDC_INIT1 ; CONTINUE IF HW PRESENT |
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; |
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; HARDWARE NOT PRESENT |
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PRTS(" NOT PRESENT$") |
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OR $FF ; SIGNAL FAILURE |
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RET |
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; |
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GDC_INIT1: |
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CALL GDC_CRTINIT ; SETUP THE GDC CHIP REGISTERS |
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CALL GDC_VDARES ; RESET GDC |
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CALL KBD_INIT ; INITIALIZE KEYBOARD DRIVER |
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|
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; ADD OURSELVES TO VDA DISPATCH TABLE |
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LD BC,GDC_FNTBL ; BC := FUNCTION TABLE ADDRESS |
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LD DE,GDC_IDAT ; DE := GDC INSTANCE DATA PTR |
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CALL VDA_ADDENT ; ADD ENTRY, A := UNIT ASSIGNED |
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|
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; INITIALIZE EMULATION |
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LD C,A ; C := ASSIGNED VIDEO DEVICE NUM |
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LD DE,GDC_FNTBL ; DE := FUNCTION TABLE ADDRESS |
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LD HL,GDC_IDAT ; HL := GDC INSTANCE DATA PTR |
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CALL TERM_ATTACH ; DO IT |
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|
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XOR A ; SIGNAL SUCCESS |
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RET |
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; |
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;====================================================================== |
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; GDC DRIVER - VIDEO DISPLAY ADAPTER (VDA) FUNCTIONS |
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;====================================================================== |
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; |
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GDC_FNTBL: |
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.DW GDC_VDAINI |
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.DW GDC_VDAQRY |
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.DW GDC_VDARES |
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.DW GDC_VDADEV |
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.DW GDC_VDASCS |
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.DW GDC_VDASCP |
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.DW GDC_VDASAT |
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.DW GDC_VDASCO |
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.DW GDC_VDAWRC |
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.DW GDC_VDAFIL |
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.DW GDC_VDACPY |
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.DW GDC_VDASCR |
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.DW KBD_STAT |
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.DW KBD_FLUSH |
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.DW KBD_READ |
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.DW GDC_VDARDC |
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#IF (($ - GDC_FNTBL) != (VDA_FNCNT * 2)) |
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.ECHO "*** INVALID GDC FUNCTION TABLE ***\n" |
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!!!!! |
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#ENDIF |
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; |
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GDC_VDAINI: |
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; RESET VDA |
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CALL GDC_VDARES ; RESET VDA |
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XOR A ; SIGNAL SUCCESS |
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RET |
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; |
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GDC_VDAQRY: ; VIDEO INFORMATION QUERY |
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LD C,$00 ; MODE ZERO IS ALL WE KNOW |
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LD D,GDC_ROWS ; ROWS |
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LD E,GDC_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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; |
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GDC_VDARES: ; VIDEO SYSTEM RESET |
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; *** TODO: RESET VIDEO SYSTEM HERE, CLEAR SCREEN, |
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; CURSOR TO TOP LEFT, CLEAR ATTRIBUTES |
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XOR A |
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RET |
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; |
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GDC_VDADEV: ; VIDEO DEVICE INFORMATION |
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LD D,VDADEV_GDC ; D := DEVICE TYPE |
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LD E,0 ; E := PHYSICAL UNIT IS ALWAYS ZERO |
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LD H,0 ; H := 0, DRIVER HAS NO MODES |
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LD L,GDC_BASE ; L := BASE I/O ADDRESS |
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XOR A ; SIGNAL SUCCESS |
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RET |
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; |
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GDC_VDASCS: ; SET CURSOR STYLE |
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CALL SYSCHK ; NOT IMPLEMENTED (YET) |
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LD A,ERR_NOTIMPL |
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OR A |
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RET |
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|
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GDC_VDASCP: ; SET CURSOR POSITION |
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CALL GDC_XY ; SET CURSOR POSITION |
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XOR A ; SIGNAL SUCCESS |
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RET |
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|
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GDC_VDASAT: ; SET ATTRIBUTES |
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LD A,E ; GET THE INCOMING ATTRIBUTE |
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LD (GDC_ATTR),A ; AND SAVE FOR LATER |
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XOR A ; SIGNAL SUCCESS |
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RET |
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|
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GDC_VDASCO: ; SET COLOR |
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LD A,E ; GET THE INCOMING COLOR |
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LD (GDC_COLOR),A ; AND SAVE FOR LATER |
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XOR A ; SIGNAL SUCCESS |
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RET |
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|
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GDC_VDAWRC: ; WRITE CHARACTER |
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LD A,E ; CHARACTER TO WRITE GOES IN A |
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CALL GDC_PUTCHAR ; PUT IT ON THE SCREEN |
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XOR A ; SIGNAL SUCCESS |
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RET |
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|
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GDC_VDAFIL: ; FILL WITH CHARACTER |
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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 GDC_FILL ; DO THE FILL |
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XOR A ; SIGNAL SUCCESS |
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RET |
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|
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GDC_VDACPY: ; COPY CHARACTERS/ATTRIBUTES |
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; LENGTH IN HL, SOURCE ROW/COL IN DE, DEST IS GDC_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 GDC_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,(GDC_POS) ; PUT DEST IN DE |
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JP GDC_BLKCPY ; DO A BLOCK COPY |
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|
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GDC_VDASCR: ; SCROLL ENTIRE SCREEN |
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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,GDC_VDASCR1 ; E IS NEGATIVE, REVERSE SCROLL |
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CALL GDC_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 GDC_VDASCR ; LOOP |
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GDC_VDASCR1: |
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CALL GDC_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 GDC_VDASCR ; LOOP |
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; |
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GDC_VDARDC: ; READ CHAR/ATTR VALUE FROM VIDEO BUFFER |
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OR $FF ; UNSUPPORTED FUNCTION |
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RET |
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; |
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;====================================================================== |
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; GDC DRIVER - PRIVATE DRIVER FUNCTIONS |
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;====================================================================== |
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; |
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;---------------------------------------------------------------------- |
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; PROBE FOR GDC HARDWARE |
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;---------------------------------------------------------------------- |
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; |
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; ON RETURN, ZF SET INDICATES HARDWARE FOUND |
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; |
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; *** TODO: IMPLEMENT THIS |
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; |
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GDC_PROBE: |
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XOR A ; SIGNAL SUCCESS |
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RET ; RETURN WITH ZF SET BASED ON CP |
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; |
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;---------------------------------------------------------------------- |
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; DISPLAY CONTROLLER CHIP INITIALIZATION |
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;---------------------------------------------------------------------- |
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; |
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; *** TODO: IMPLEMENT THIS |
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; |
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GDC_CRTINIT: |
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XOR A ; SIGNAL SUCCESS |
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RET |
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; |
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;---------------------------------------------------------------------- |
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; SET CURSOR POSITION TO ROW IN D AND COLUMN IN E |
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;---------------------------------------------------------------------- |
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; |
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GDC_XY: |
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CALL GDC_XY2IDX ; CONVERT ROW/COL TO BUF IDX |
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LD (GDC_POS),HL ; SAVE THE RESULT (DISPLAY POSITION) |
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; *** TODO: MOVE THE CURSOR |
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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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GDC_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,GDC_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 POSITION, ADVANCE CURSOR |
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;---------------------------------------------------------------------- |
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; |
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GDC_PUTCHAR: |
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; *** TODO: IMPLEMENT THIS |
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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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GDC_FILL: |
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; *** TODO: IMPLEMENT THIS |
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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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GDC_SCROLL: |
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; *** TODO: IMPLEMENT THIS |
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RET |
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; |
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;---------------------------------------------------------------------- |
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; REVERSE SCROLL ENTIRE SCREEN BY ONE LINE (CURSOR POSITION UNCHANGED) |
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;---------------------------------------------------------------------- |
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; |
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GDC_RSCROLL: |
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; *** TODO: IMPLEMENT THIS |
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RET |
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; |
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;---------------------------------------------------------------------- |
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; BLOCK COPY BC BYTES FROM HL TO DE |
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;---------------------------------------------------------------------- |
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; |
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GDC_BLKCPY: |
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; *** TODO: IMPLEMENT THIS |
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RET |
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; |
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;================================================================================================== |
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; GDC DRIVER - DATA |
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;================================================================================================== |
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; |
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GDC_ATTR .DB 0 ; CURRENT ATTRIBUTES |
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GDC_COLOR .DB 0 ; CURRENT COLOR |
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GDC_POS .DW 0 ; CURRENT DISPLAY POSITION |
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; |
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;================================================================================================== |
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; GDC DRIVER - INSTANCE DATA |
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;================================================================================================== |
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; |
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GDC_IDAT: |
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.DB GDC_KBDST |
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.DB GDC_KBDDATA |
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