mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-02 12:52:03 +00:00
c8cac53c5e
Massive updates that changes the way most subroutines are handled. Major bugfixes, various utilities added, started higher-level libraries.
120 lines
2.6 KiB
Plaintext
120 lines
2.6 KiB
Plaintext
*
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*``````````````````````````````*
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* TXTPUT : PUT CHAR AT X,Y POS *
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* *
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* SIMPLY PLOTS A CHARACTER AT *
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* GIVEN X,Y DIRECTLY TO MEMORY *
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*- -*
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* CLOBBERS: *
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* *
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* FLAGS: ???----- REG: A-YM *
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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 #10 ; XPOS *
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* PHA *
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* LDA #5 ; YPOS *
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* PHA *
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* LDA #AA ; FILL CHAR *
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* PHA *
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* JSR TXTPUT *
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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 CHARACTER *
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* Y POSITION *
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* X POSITION *
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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 = TRASH *
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* X = TRASH *
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* Y = TRASH *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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TXTPUT
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*
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** GET 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 VARIABLES
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*
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PLA
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STA :F ; FILL
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PLA
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STA :Y
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PLA
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STA :X
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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 :X
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CMP #40 ; MAX COL + 1
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BCS :XOVF
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LDA :Y
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CMP #24
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BCS :YOVF
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JMP :ERREND
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:XOVF
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_ERR #:E_SID;#:E_XOF;#:E_DMP1;#:F;#3
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JMP :ERREND
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:YOVF
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_ERR #:E_SID;#:E_YOF;#:E_DMP1;#:F;#3
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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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LDA :Y
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LDY :X
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JSR $F847
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LDA :F
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STA ($26),Y
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*
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**
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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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:F DS 1
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:Y DS 1
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:X DS 1
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*
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:E_SID ASC "TXTPUT (TPUT MACRO)",00
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:E_DMP1 ASC "DUMPING F(1) Y(1) X(1):",00
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:E_XOF ASC "X OVERFLOW. X <> MIN/MAX",00
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:E_YOF ASC "Y OVERFLOW. Y <> MIN/MAX",00
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*
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