Dynamite Dan
Routines
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FF4E: Get tape signal
Used by the routines at
FEAB
,
FEFA
and
FF2A
.
Input
B
On input, timing constant. On output, holds the time taken to find an edge change. If found before the timing constant value, a '0' bit was found, otherwise it was a '1' bit.
C
Border colour and previous EAR signal bit
FF4E
CALL
$FF52
FF51
RET NC
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FF52