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107 lines
2.9 KiB
Plaintext
107 lines
2.9 KiB
Plaintext
;Screen Control Assembly Language Routines for Oric-1
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; Display Colors
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BLACK EQU 0 Black
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RED EQU 1 Red
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GREEN EQU 2 Green
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YELLOW EQU 3 Yellow
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BLUE EQU 4 Blue
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MAGENT EQU 5 Magenta
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CYAN EQU 6 Cyan
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WHITE EQU 7 White
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;ASCII Screen Control Characters
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CHRBEL EQU $07 Beep (Bell)
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CHRBLK EQU $FF Block
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CHRCAP EQU $14 Caps Lock ()
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CHRCKR EQU $7E Checkerboard
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CHRCLR EQU $0C Clear (Form Feed)
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CHRDEL EQU $7F Delete (Delete)
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CHRDWN EQU $0A Cursor Down (Line Feed)
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CHRFLS EQU 140 Flash On
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CHRHOM EQU $00 Home (None)
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CHRINS EQU $00 Insert
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CHRLFT EQU $08 Cursor Left (Backspace)
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CHRRGT EQU $09 Cursor Right (Tab)
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CHRRTN EQU $0D Return (Carriage Return)
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CHRRVF EQU $00 Reverse Off
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CHRRVN EQU $00 Reverse On
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CHRUP EQU $0B Cursor Up (Vertical Tab)
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;ASCII Box Drawing Characters
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BOXBLC EQU 43 Bottom Left Corner (+)
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BOXBRC EQU 43 Bottom Right Corner (+)
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BOXBCT EQU 45 Bottom to Cetter Tee (-)
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BOXCTR EQU 123 Center Cross (+)
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BOXHLN EQU 45 Horizontal Line (-)
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BOXLCT EQU 124 Left To Center T (|)
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BOXRCT EQU 124 Right To Center T (|)
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BOXTLC EQU 43 Top Left Corner (+)
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BOXTRC EQU 43 Top Right Corner (+)
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BOXTCT EQU 45 Top to Center T (-)
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BOXVLN EQU 124 Vertical Line (|)
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;ASCII Color Code Table
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CLRCDS DC 128, 129, 130, 131, 132, 133, 134, 136
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;Set Background Color
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;Args: A = Oric Color Code
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;Uses: TEMP0 - Temporary Storage
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;Affects: A,C,N,Z
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SCRBKG: AND $07 ;Strip High Bits
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ORA $90 ;Convert to Control Character
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JMP PRCHR ;Print Character and Return
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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: AND $07 ;Strip High Bits
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ORA $80 ;Convert to 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 #CHRCLR ;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 #CHRDWN ;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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SCRHOM: LDA #0 ;Column 0
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TAY ;Row 0
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BEQ SRCMOV ;Move Cursor
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;Move Cursor Left
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;Affects A,C,N,Z
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SCRLFT: LDA #CHRLFT ;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 #CHRRGT ;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 #CHRUP ;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: RTS ;Not Yet Implemented
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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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SCRPOS: RTS ;Not Yet Implemented
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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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SCRSIZ: RTS ;Not Yet Implemented
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