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fix sense of DATA line reading.

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Paul Gardner-Stephen committed 2019-05-01 22:11:17 +09:30
1 parent 38b35d05ad
commit 9f0880ed7e
1 file changed
+5 -2
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c64/kernal/iec_tx_byte.s
+5 -2
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@@ -9,10 +9,12 @@ iec_tx_byte:
;; Did a device respond? (DATA will be pulled if so) ;; Did a device respond? (DATA will be pulled if so)
lda $DD00 lda $DD00
bmi + sta $0418
bpl +
;; No devices present, so we can immediately return with device not found ;; No devices present, so we can immediately return with device not found
pla pla
inc $420
jmp kernalerror_DEVICE_NOT_FOUND jmp kernalerror_DEVICE_NOT_FOUND
* *
@@ -71,11 +73,12 @@ iec_tx_byte_l1:
;; try a set number of times ;; try a set number of times
ldx #$ff ldx #$ff
* lda $DD00 * lda $DD00
bmi + bpl +
dex dex
bne - bne -
;; Timeout - DEVICE NOT PRESENT ;; Timeout - DEVICE NOT PRESENT
inc $421
jmp kernalerror_DEVICE_NOT_FOUND jmp kernalerror_DEVICE_NOT_FOUND
* *
;; All done. ;; All done.