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IEC serial bytes have 8 bits, not 9. Fix logic to count 8 bits on TX

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Paul Gardner-Stephen committed 2019-05-01 22:16:33 +09:30
1 parent 7caae74955
commit 3a8200d66d
2 files changed
+3 -3
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c64/kernal/iec_tx_byte.s
+1 -1
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@@ -62,7 +62,7 @@ iec_tx_byte_l1:
;; More bits to send? ;; More bits to send?
pla pla
dex dex
bpl iec_tx_byte_nextbit bne iec_tx_byte_nextbit
;; Done sending bits. Wait for acknowledgement ;; Done sending bits. Wait for acknowledgement
jsr iec_assert_clk_release_data jsr iec_assert_clk_release_data
c64/kernal/iec_wait20us.s
+2 -2
View File
@@ -2,6 +2,6 @@
iec_wait20us: iec_wait20us:
;; Wait 20usec ;; Wait 20usec
;; JSR + RTS already costs 12, so need only 8 more ;; JSR + RTS already costs 12, so need only 8 more
ldx $dd00 ldy $dd00
ldx $dd00 ldy $dd00
rts rts