mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-11-24 22:32:42 +00:00
84 lines
1.4 KiB
Plaintext
84 lines
1.4 KiB
Plaintext
|
*
|
||
|
|
SUBDEL
|
||
|
|
*
|
||
|
|
PLA
|
||
|
|
TAY
|
||
|
|
PLA
|
||
|
|
TAX
|
||
|
|
PLA
|
||
|
|
STA :SCNT
|
||
|
|
PLA
|
||
|
|
STA :SINDEX
|
||
|
|
PLA
|
||
|
|
STA ADDR1
|
||
|
|
PLA
|
||
|
|
STA ADDR1+1
|
||
|
|
TXA
|
||
|
|
PHA
|
||
|
|
TYA
|
||
|
|
PHA
|
||
|
|
LDY #0
|
||
|
|
STY :SCERR
|
||
|
|
LDA (ADDR1),Y
|
||
|
|
STA :S1LEN
|
||
|
|
LDA :SCNT
|
||
|
|
BEQ :OKEXIT
|
||
|
|
LDA :SINDEX
|
||
|
|
BEQ :ERREXIT
|
||
|
|
LDA :S1LEN
|
||
|
|
CMP :SINDEX
|
||
|
|
BCC :ERREXIT
|
||
|
|
LDA :SINDEX
|
||
|
|
CLC
|
||
|
|
ADC :SCNT
|
||
|
|
BCS :TRUNC
|
||
|
|
STA :SIDX
|
||
|
|
TAX
|
||
|
|
DEX
|
||
|
|
CPX :S1LEN
|
||
|
|
BCC :CNTOK
|
||
|
|
BEQ :TRUNC
|
||
|
|
LDA #$0FF
|
||
|
|
STA :SCERR
|
||
|
|
:TRUNC
|
||
|
|
LDX :SINDEX
|
||
|
|
DEX
|
||
|
|
STX :S1LEN
|
||
|
|
LDA :SCERR
|
||
|
|
BEQ :OKEXIT
|
||
|
|
BNE :ERREXIT
|
||
|
|
:CNTOK
|
||
|
|
LDA :S1LEN
|
||
|
|
SEC
|
||
|
|
SBC :SIDX
|
||
|
|
TAX
|
||
|
|
INX
|
||
|
|
BEQ :OKEXIT
|
||
|
|
:MVLP
|
||
|
|
LDY :SIDX
|
||
|
|
LDA (ADDR1),Y
|
||
|
|
LDY :SINDEX
|
||
|
|
STA (ADDR1),Y
|
||
|
|
INC :SINDEX
|
||
|
|
INC :SIDX
|
||
|
|
DEX
|
||
|
|
BNE :MVLP
|
||
|
|
LDX :SINDEX
|
||
|
|
DEX
|
||
|
|
STX :S1LEN
|
||
|
|
:OKEXIT
|
||
|
|
CLC
|
||
|
|
BCC :EXIT
|
||
|
|
:ERREXIT
|
||
|
|
SEC
|
||
|
|
:EXIT
|
||
|
|
LDA :S1LEN
|
||
|
|
LDY #0
|
||
|
|
STA (ADDR1),Y
|
||
|
|
RTS
|
||
|
|
:S1LEN DS 1
|
||
|
|
:SCNT DS 1
|
||
|
|
:SINDEX DS 1
|
||
|
|
:SIDX DS 1
|
||
|
|
:SCERR DS 1
|