2018-11-07 05:11:09 +00:00
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;Screen Control Assembly Language Routines for Atari 400 & 800
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;*** Incomplete - Copied from Oric-1 ***
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2018-09-17 00:30:25 +00:00
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; Display Colors
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BLACK EQU $00 Black
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RED EQU $00 Red
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GREEN EQU $00 Green
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YELLOW EQU $00 Yellow
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BLUE EQU $00 Blue
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MAGENT EQU $00 Magenta
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CYAN EQU $00 Cyan
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WHITE EQU $00 White
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;ASCII Screen Control Characters
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CHRBCK EQU $7E Backspace
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CHRBEL EQU $FD Beep (Buzzer)
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CHRCLR EQU $7D Clear Screen
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CHRDEL EQU $FE Delete (Character)
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CHRDWN EQU $1C Cursor Down
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CHRFLS EQU $00 Flash On
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CHRHOM EQU $00 Home (None)
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CHRINS EQU $FF Insert (Character)
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CHRLFT EQU $1E Cursor Left
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CHRRGT EQU $1F Cursor Right
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CHRRTN EQU $9B Return (End of Line)
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CHRTAB EQU $7F Tab
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CHRUP EQU $1B Cursor Up
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;ATASCII Symbolic Characters
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CHRBLK EQU $A0 Block
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;ASCII Box Drawing Characters
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BOXBLC EQU $0A Bottom Left Corner
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BOXBRC EQU $03 Bottom Right Corner
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BOXBCT EQU $18 Bottom to Cetter Tee
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BOXCTR EQU $13 Center Cross
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BOXHLN EQU $12 Horizontal Line
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BOXLCT EQU $01 Left To Center T)
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BOXRCT EQU $04 Right To Center T
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BOXTLC EQU $11 Top Left Corner
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BOXTRC EQU $05 Top Right Corner
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BOXTCT EQU $17 Top to Center T
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BOXVLN EQU $7C Vertical Line (|)
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;Set Background Color
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;Args: A = Atari 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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