mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-11 09:49:17 +00:00
12a0b19398
- added some error control - added initial jump table - fixed a few minor bugs - separated common library into separate subroutine files
134 lines
2.8 KiB
Plaintext
134 lines
2.8 KiB
Plaintext
*
|
|
*``````````````````````````````*
|
|
* ZMLOAD :: RESTORE 0-PAGE MEM *
|
|
*- -*
|
|
* RESTORES PREVIOUSLY SAVED *
|
|
* ZERO PAGE VALUES FROM *
|
|
* HIGHER MEMORY LOCATION. *
|
|
* CLOBBERS: *
|
|
* *
|
|
* FLAGS: ????---- REG: AXYM *
|
|
*- -*
|
|
* CYCLES: ??? *
|
|
* SIZE: *
|
|
*- -*
|
|
* USAGE: *
|
|
* *
|
|
* LDA #>$6A00 *
|
|
* PHA *
|
|
* LDA #<$6A00 *
|
|
* PHA *
|
|
* JSR ZMLOAD *
|
|
*- -*
|
|
* ENTRY *
|
|
* *
|
|
* TOP OF STACK *
|
|
* *
|
|
* LOW BYTE OF RETURN ADDRESS *
|
|
* HI BYTE OF RETURN ADDRESS *
|
|
* LOW BYTE OF SOURCE *
|
|
* HIGH BYTE OF SOURCE *
|
|
*- -*
|
|
* EXIT *
|
|
* *
|
|
* TOP OF STACK *
|
|
* *
|
|
* LOW BYTE OF RETURN ADDRESS *
|
|
* HI BYTE OF RETURN ADDRESS *
|
|
* *
|
|
*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
|
|
*
|
|
ZMLOAD
|
|
*
|
|
** SAVE RETURN ADDRESS
|
|
*
|
|
PLA
|
|
STA :RETADR
|
|
PLA
|
|
STA :RETADR+1
|
|
*
|
|
** GET PARAMETERS
|
|
*
|
|
PLA
|
|
STA ADDR1
|
|
PLA
|
|
STA ADDR1+1
|
|
*
|
|
** COPY ZERO PAGE TO SPECIFIED
|
|
** NON-ZERO LOCATION (ONLY THE
|
|
** FREE ONES..)
|
|
*
|
|
LDY #2 ; START 2 AHEAD
|
|
LDA (ADDR1),Y ; AND PUT ADDR1
|
|
STA $08 ; AREA LAST
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $09
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $19
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $1E
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $E3
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $EB
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $EC
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $ED
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $EE
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $EF
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $FA
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $FB
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $FC
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $FD
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $FE
|
|
INY
|
|
LDA (ADDR1),Y
|
|
STA $FF
|
|
*
|
|
** NOW GET ZERO PAGE VALUES
|
|
** FOR SPACE OCCUPIED BY ADDR; RETURN IN X,Y
|
|
*
|
|
LDY #0
|
|
LDA (ADDR1),Y
|
|
TAX
|
|
LDA (ADDR1+1),Y
|
|
TAY
|
|
STX ADDR1
|
|
STY ADDR1+1
|
|
*
|
|
** RESTORE RETURN ADDRESS
|
|
*
|
|
LDA :RETADR+1
|
|
PHA
|
|
LDA :RETADR
|
|
PHA
|
|
*
|
|
RTS
|
|
*
|
|
** DATA
|
|
*
|
|
:RETADR DS 2
|
|
*
|