mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-12 16:29:26 +00:00
175 lines
3.7 KiB
Plaintext
175 lines
3.7 KiB
Plaintext
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*``````````````````````````````*
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* TFILLA :: TEXT FILL AREA *
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*- -*
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* FILLS A RECTANGULAR AREA OF *
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* THE SCREEN WITH THE DESIRED *
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* CHARACTER. *
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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 (LEFT BOUND) *
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* PHA *
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* LDA (UPPER BOUND) *
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* PHA *
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* LDA (RIGHT BOUND) *
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* PHA *
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* LDA (BOTTOM BOUND) *
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* PHA *
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* LDA (FILL CHAR) *
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* PHA *
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* JSR TFILLA *
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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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* FILL CHAR (:FILL) *
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* BOTTOM BOUND (:BOTTOM) *
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* RIGHT BOUND (:RIGHT) *
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* TOP BOUND (:TOP) *
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* LEFT BOUND (:LEFT) *
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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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* A = LOW BYTE OF ADDRESS *
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* X = COUNTER DATA; TRASH *
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* Y = COUNTER DATA; TRASH *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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TFILLA
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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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** LOAD 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 :Y2
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PLA
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STA :X2
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PLA
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STA :YC
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STA :Y1
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PLA
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STA :XC
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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 ; X1 => X2?
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BCS :X1HI
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LDA :Y1
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CMP :Y2
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BCS :Y1HI ; Y1 => Y2?
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LDA :X1
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CMP #40
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BCS :XOVF
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LDA :X2
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CMP #40
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BCS :XOVF
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LDA :Y1
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CMP #24
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BCS :YOVF
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LDA :Y2
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CMP #24
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BCS :YOVF
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JMP :ERREND
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:X1HI
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_ERR :E_SID;:E_X1H;:E_DMP1;:X1;#7
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JMP :ERREND
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:Y1HI
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_ERR :E_SID;:E_Y1H;:E_DMP1;:X1;#7
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JMP :ERREND
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:XOVF
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_ERR :E_SID;:E_XOF;:E_DMP1;:X1;#7
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JMP :ERREND
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:YOVF
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_ERR :E_SID;:E_YOF;:E_DMP1;:X1;#7
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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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*
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:LP1
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LDA :YC
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LDY :XC
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JSR $F847 ; GBASCALC
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LDA :F
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STA ($26),Y
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LDA :YC
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INY
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STY :XC
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CPY :X2
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BNE :LP1
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*
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LDA :X1
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STA :XC
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INC :YC
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LDA :YC
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CMP :Y2
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BNE :LP1
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*
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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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*
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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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:Y1 DS 1
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:Y2 DS 1
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:XC DS 1
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:YC DS 1
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:F DS 1
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*
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:E_SID ASC "TFILLA (TFILL MACRO)",00
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:E_DMP1 ASC "DUMPING X1(1) X2(1) Y1(1) Y2(1)"
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ASC "XC(1) YC(1) F(1)",00
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:E_X1H ASC "X1 MUST BE LOWER THAN X2.",00
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:E_Y1H ASC "Y1 MUST BE LOWER THAN Y2.",00
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:E_XOF ASC "X <> MIN/MAX COLUMNS.",00
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:E_YOF ASC "Y <> MIN/MAX ROWS",00
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*
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