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... and actually read the DATA bit when recording data in iec_rx_byte

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Paul Gardner-Stephen committed 2019-05-04 22:20:57 +09:30
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commit ea070f9bfe
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c64/kernal/iec_rx_byte.s
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@@ -66,14 +66,13 @@ iec_rx_bit_loop:
inc $0635 inc $0635
;; DATA now has the next bit, but inverted. ;; DATA now has the next bit, but inverted.
;; DATA is in bit6, which is a bit annoying. ;; DATA is in bit7, which is a bit annoying.
;; But we can clock it out with two ROL instructions ;; But we can clock it out with a ROL instruction
;; so that it is in C. We can then ROL it into the ;; so that it is in C. We can then ROL it into the
;; partial data byte ;; partial data byte
;; Move data bit into C flag ;; Move data bit into C flag
LDA $DD00 LDA $DD00
ROL ROL
ROL
;; Pull it into the data byte ;; Pull it into the data byte
pla pla
ROL ROL