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https://github.com/RevCurtisP/C02.git
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125 lines
3.5 KiB
Plaintext
125 lines
3.5 KiB
Plaintext
;Screen Control Assembly Lanuage Routines for C02
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;Vic Display Colors
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BLACK EQU 0 Black
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WHITE EQU 1 White
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RED EQU 2 Red
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CYAN EQU 3 Cyan
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MAGENT EQU 4 Purple
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GREEN EQU 5 Green
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BLUE EQU 6 Blue
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YELLOW EQU 7 Yellow
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;PETSCII Screen Control Characters
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CHRCLR EQU 147 Clear (CLR)
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CHRDEL EQU 20 Delete (DEL)
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CHRDN EQU 17 Cursor Down
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CHRRTN EQU 13 Return
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CHRFN1 EQU 133 Function Key 1 (F1)
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CHRFN2 EQU 137 Function Key 2 (F2)
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CHRFN3 EQU 134 Function Key 3 (F3)
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CHRFN4 EQU 138 Function Key 4 (F4)
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CHRFN5 EQU 135 Function Key 5 (F5)
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CHRFN6 EQU 139 Function Key 6 (F6)
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CHRFN7 EQU 136 Function Key 7 (F7)
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CHRFN8 EQU 140 Function Key 8 (F8)
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CHRHOM EQU 19 Home
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CHRINS EQU 148 Insert
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CHRLFT EQU 157 Cursor Left
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CHRRGT EQU 29 Cursor Left
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CHRRVF EQU 146 Reverse Off
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CHRRVN EQU 18 Reverse On
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CHRUP EQU 145 Cursor Up
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;PETSCII Box Drawing Characters
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BOXBLC EQU 173 Bottom Left Corner
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BOXBRC EQU 189 Bottom Right Corner
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BOXBCT EQU 177 Bottom to Cetter Tee
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BOXCTR EQU 123 Center Cross
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BOXHLN EQU 96 Horizontal Line
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BOXLCT EQU 171 Left To Center T
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BOXRCT EQU 179 Right To Center T
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BOXTLC EQU 176 Top Left Corner
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BOXTRC EQU 174 Top Right Corner
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BOXTCT EQU 178 Top to Center T
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BOXVLN EQU 98 Verical Line
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;PETSCII Color Code Table
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CLRCDS DC 144, 5, 28, 159, 156, 30, 32, 158
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;Set Background Color
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;Args: A = Vic Color Code
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;Uses: TEMP0 - Temporary Storage
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;Affects: A,C,N,Z
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SCRBKG: LSR ;Shift Color Code 4 Bits Left
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LSR
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LSR
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LSR
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STA TEMP0 ;Save it
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LDA $900F ;Read VIC Color Control Register
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AND #$15 ;Strip Existing Backround Color
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ORA ;Add in Background Color
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STA $900F ;Write back to VIC Chip
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RTS
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;Set Text Color
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;Args: A = Vic color code
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;Affects: A,X,C,N,Z
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SCRTXT: TAX ;Transfer Color Code to Index
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LDA CLRTBL,X ;Load PETSCII Color Control Character
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JMP PRCHR ;Print Character and Return
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;Clear Screen
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;Affects A,C,N,Z
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SCRCLR: LDA #CLEAR ;Load Clear Screen Character
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JMP PRCHR ;Print it and Return
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;Move Cursor Down
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;Affects A,C,N,Z
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SCRDWN: LDA #DOWN ;Load Cursor Down Character
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JMP PRCHR ;Print it and Return
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;Move Cursor To Home Position
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;Affects A,C,N,Z
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SRCHOM: LDA #HOME ;Load Cursor Home Character
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JMP PRCHR ;Print it and Return
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;Move Cursor Left
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;Affects A,C,N,Z
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SCRLFT: LDA #LEFT ;Load Cursor Left Character
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JMP PRCHR ;Print it and Return
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;Move Cursor Right
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;Affects A,C,N,Z
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SCRRGT: LDA #RIGHT ;Load Cursor Left Character
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JMP PRCHR ;Print it and Return
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;Move Cursor Up
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;Affects A,C,N,Z
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SCRUP: LDA #UP ;Load Cursor Left Character
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JMP PRCHR ;Print it and Return
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;Move Cursor to Specified Coordinates
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;Args: A = screen column (0 = top)
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; Y = screen line (0 = left)
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SCRMOV: TAX ;Transfer Column to X Register
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CLC ;Clear Carry Flag
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JMP $FFF0 ;Call PLOT Kernal Routine and Return
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;Get Cursor Position
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;Returns: A = current cursor column
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; Y = current cursor row
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; X = current cursor column
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SCRPOS: SEC ;Set Carry Flag
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JSR $FFF0 ;Call PLOT Kernal Routine
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TXA ;Transfer Column to Accumulator
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RTS
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;Get Screen Size
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;Returns: A = width of screen in columns
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; Y = height of screen in rows
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; X = width of screen in columns
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SCRSIZ: JSR $FFED ;Call SCREEN Kernal Routine
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TXA ;Transfer Width to Accumulator
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RTS
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