mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-11-30 15:49:55 +00:00
67 lines
1.6 KiB
Plaintext
67 lines
1.6 KiB
Plaintext
TVLINE
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PLA
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STA RETADR
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PLA
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STA RETADR+1
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PLA
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STA :F ; FILL CHAR
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PLA
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STA :X ; X POS
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PLA
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STA :Y2 ; END
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PLA
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STA :Y1 ; START
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LDA ERRCTRL
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CMP #1
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BEQ :CHKERR
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JMP :ERREND
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:CHKERR
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LDA :Y1
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CMP :Y2
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BCS :ERRTOOHI ; Y1 => Y2
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LDA :Y2
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CMP #24
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BCS :ERRYOVF ; Y VALUE OVERFLOW
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LDA :X
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CMP #40 ; MAX COLS + 1
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BCS :ERRXOVF
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LDA :Y1
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CMP #24 ; MAX ROWS + 1
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BCS :ERRYOVF
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JMP :ERREND
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:ERRTOOHI
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_ERR :E_SID;:E_YHI;:E_DMP1;:X;#4
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JMP :ERREND
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:ERRXOVF
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_ERR :E_SID;:E_XOF;:E_DMP1;:X;#4
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JMP :ERREND
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:ERRYOVF
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_ERR :E_SID;:E_YOF;:E_DMP1;:X;#4
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JMP :ERREND
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:ERREND
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LDA :Y1
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LDY :X
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:LOOP
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JSR $F847 ; GBASCALC ROUTINE
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LDA :F
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STA ($26),Y ; PLOT TO SCREEN MEMORY
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INC :Y1
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LDA :Y1
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CMP :Y2 ; IF Y1 < Y2
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BNE :LOOP ; LOOP; ELSE, CONTINUE
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:EXIT
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LDA RETADR+1
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PHA
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LDA RETADR
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PHA
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RTS
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:X DS 1
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:Y1 DS 1
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:Y2 DS 1
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:F DS 1
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:E_SID ASC "TVLINE (TVLIN MACRO)",00
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:E_DMP1 ASC "DUMPING X(1) Y1(1) Y2(1) F(1)",00
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:E_YHI ASC "Y1 MUST BE LOWER THAN Y2.",00
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:E_XOF ASC "X > # OF AVAILABLE COLUMNS.",00
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:E_YOF ASC "Y > # OF AVAILABLE ROWS",00
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