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fix bug in iec_tx_byte in acknowledgement check.

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Paul Gardner-Stephen committed 2019-05-04 22:01:36 +09:30
1 parent cdbb1b8c58
commit 84841ab283
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+3 -1
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c64/kernal/iec_tx_byte.s
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@@ -80,7 +80,9 @@ iec_tx_byte_l1:
;; try a set number of times ;; try a set number of times
ldx #$ff ldx #$ff
* lda $DD00 * lda $DD00
bne + ;; BPL here is checking that bit 7 of $DD00 clears,
;; i.e, that the DATA line is asserted.
bpl +
dex dex
bne - bne -