mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2025-02-19 21:30:37 +00:00
120 lines
2.6 KiB
Plaintext
120 lines
2.6 KiB
Plaintext
*
|
|
*``````````````````````````````*
|
|
* TXTPUT : PUT CHAR AT X,Y POS *
|
|
* *
|
|
* SIMPLY PLOTS A CHARACTER AT *
|
|
* GIVEN X,Y DIRECTLY TO MEMORY *
|
|
*- -*
|
|
* CLOBBERS: *
|
|
* *
|
|
* FLAGS: ???----- REG: A-YM *
|
|
*- -*
|
|
* CYCLES: ??? *
|
|
* SIZE: *
|
|
*- -*
|
|
* USAGE: *
|
|
* LDA #10 ; XPOS *
|
|
* PHA *
|
|
* LDA #5 ; YPOS *
|
|
* PHA *
|
|
* LDA #AA ; FILL CHAR *
|
|
* PHA *
|
|
* JSR TXTPUT *
|
|
*- -*
|
|
* ENTRY *
|
|
* *
|
|
* TOP OF STACK *
|
|
* *
|
|
* LOW BYTE OF RETURN ADDRESS *
|
|
* HI BYTE OF RETURN ADDRESS *
|
|
* FILL CHARACTER *
|
|
* Y POSITION *
|
|
* X POSITION *
|
|
*- -*
|
|
* EXIT *
|
|
* *
|
|
* TOP OF STACK *
|
|
* *
|
|
* LOW BYTE OF RETURN ADDRESS *
|
|
* HI BYTE OF RETURN ADDRESS *
|
|
* *
|
|
* A = TRASH *
|
|
* X = TRASH *
|
|
* Y = TRASH *
|
|
*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
|
|
*
|
|
TXTPUT
|
|
*
|
|
** GET RETURN ADDRESS
|
|
*
|
|
PLA
|
|
STA RETADR
|
|
PLA
|
|
STA RETADR+1
|
|
*
|
|
** GET VARIABLES
|
|
*
|
|
PLA
|
|
STA :F ; FILL
|
|
PLA
|
|
STA :Y
|
|
PLA
|
|
STA :X
|
|
*
|
|
********************************
|
|
*
|
|
** ERROR CONTROL
|
|
*
|
|
********************************
|
|
*
|
|
LDA ERRCTRL
|
|
CMP #1
|
|
BEQ :CHKERR
|
|
JMP :ERREND
|
|
:CHKERR
|
|
LDA :X
|
|
CMP #40 ; MAX COL + 1
|
|
BCS :XOVF
|
|
LDA :Y
|
|
CMP #24
|
|
BCS :YOVF
|
|
JMP :ERREND
|
|
:XOVF
|
|
_ERR :E_SID;:E_XOF;:E_DMP1;:F;#3
|
|
JMP :ERREND
|
|
:YOVF
|
|
_ERR :E_SID;:E_YOF;:E_DMP1;:F;#3
|
|
*
|
|
********************************
|
|
*
|
|
:ERREND
|
|
*
|
|
********************************
|
|
*
|
|
*
|
|
LDA :Y
|
|
LDY :X
|
|
JSR $F847
|
|
LDA :F
|
|
STA ($26),Y
|
|
*
|
|
**
|
|
*
|
|
LDA RETADR+1
|
|
PHA
|
|
LDA RETADR
|
|
PHA
|
|
RTS
|
|
*
|
|
** DATA
|
|
*
|
|
:F DS 1
|
|
:Y DS 1
|
|
:X DS 1
|
|
*
|
|
:E_SID ASC "TXTPUT (TPUT MACRO)",00
|
|
:E_DMP1 ASC "DUMPING F(1) Y(1) X(1):",00
|
|
:E_XOF ASC "X OVERFLOW. X <> MIN/MAX",00
|
|
:E_YOF ASC "Y OVERFLOW. Y <> MIN/MAX",00
|
|
*
|