mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-11 09:49:17 +00:00
67 lines
1.6 KiB
Plaintext
67 lines
1.6 KiB
Plaintext
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THLINE
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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
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PLA
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STA :Y
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PLA
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STA :X2
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PLA
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STA :X1
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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 :X1
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CMP :X2
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BCS :ERRTOOHI ; X1 => X2
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LDA :X1
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CMP #39
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BCS :ERRXOVF ; X VALUE OVERFLOW
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LDA :X2
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CMP #40 ; MAX COLS + 1
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BCS :ERRXOVF
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LDA :Y
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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_XHI;:E_DMP1;:X1;#4
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JMP :ERREND
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:ERRXOVF
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_ERR :E_SID;:E_XOF;:E_DMP1;:X1;#4
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JMP :ERREND
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:ERRYOVF
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_ERR :E_SID;:E_YOF;:E_DMP1;:X1;#4
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JMP :ERREND
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:ERREND
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LDA :Y ; LOAD ROW
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LDY :X1 ; LOAD X START POS
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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 ; PUSH TO SCREEN MEMORY
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LDA :Y
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INY ; INCREASE X POS
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CPY :X2 ; IF LESS THAN X END POS
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BNE :LOOP ; REPEAT UNTIL DONE
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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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:X1 DS 1
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:X2 DS 1
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:Y DS 1
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:F DS 1 ; FILL CHAR
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:E_SID ASC "THLINE (THLIN MACRO)",00
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:E_DMP1 ASC "DUMPING X1(1) X1(1) Y(1) F(1)",00
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:E_XHI ASC "X1 MUST BE LOWER THAN X2.",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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