mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-11-30 15:49:55 +00:00
c8cac53c5e
Massive updates that changes the way most subroutines are handled. Major bugfixes, various utilities added, started higher-level libraries.
143 lines
3.4 KiB
Plaintext
143 lines
3.4 KiB
Plaintext
*
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*``````````````````````````````*
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* THLINE :: TEXT HORIZ LINE *
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*- -*
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* CREATES A HORIZONTAL LINE OF *
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* TEXT COMPOSED OF THE FILL *
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* CHARACTER SPECIFIED AT Y. *
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*- -*
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* CLOBBERS: *
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* *
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* FLAGS: ????---- REG: AXYM *
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*- -*
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* CYCLES: ??? *
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* SIZE: *
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*- -*
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* USAGE: *
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* LDA (X-START) *
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* PHA *
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* LDA (X-END) *
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* PHA *
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* LDA (Y-POS) *
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* PHA *
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* LDA (FILL CHAR) *
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* PHA *
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* JSR THLINE *
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*- -*
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* ENTRY *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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* XPOS START OF LINE (:X1) *
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* XPOS END OF LINE (:X2) *
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* YPOS OF LINE (:Y) *
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* FILL CHARACTER (:F) *
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*- -*
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* EXIT *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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* *
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* Y = START,END OF LINE *
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* X = ??? *
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* A = LOW BYTE OF RET ADDR *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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THLINE
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*
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** SAVE RETURN ADDRESS
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*
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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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*
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** GET PARAMETERS
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*
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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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*
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********************************
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*
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** ERROR CONTROL
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*
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********************************
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*
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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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*
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********************************
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*
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:ERREND
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*
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********************************
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*
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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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*
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** RESTORE RETURN ADDRESS
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*
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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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*
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** DATA
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*
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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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*
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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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*
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