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Set of Apple II Hard Drive Images
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pdoseric.hdv
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SOFTTHRU.SRC.txt
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2020-08-13
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702b
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41 lines
; SOFT THRU
;
CTRLREG EQU $C0A8
DATAREG EQU $C0A9
PTR EQU $06
;
ORG $300
BEGIN LDA #$00
STA PTR
LDA #$20
STA PTR+1
LDA DATAREG
WAITRCRV LDA CTRLREG
AND #$01
BEQ WAITRCRV
LDA DATAREG
CMP #$F0
BCS WAITRCRV
CMP #$90
BEQ GOT90
SENDIT STA DATAREG
WAITSEND LDA CTRLREG
AND #$02
BEQ WAITSEND
JMP WAITRCRV
;
GOT90 LDA CTRLREG
AND #$01
BEQ GOT90
LDA DATAREG
CMP #$43
BEQ GOT43
JMP SENDIT
;
GOT43 LDA CTRLREG
AND #$01
BEQ GOT43
LDA DATAREG
LSR
JMP SENDIT