Routines
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FB97: new tape byte setup
Used by the routines at F875, FA60, FBCD and FC6A.
FB97 A9 08 LDA #$08 eight bits to do
FB99 85 A3 STA $A3 set bit count
FB9B A9 00 LDA #$00 clear A
FB9D 85 A4 STA $A4 clear tape bit cycle phase
FB9F 85 A8 STA $A8 clear start bit first cycle done flag
FBA1 85 9B STA $9B clear byte parity
FBA3 85 A9 STA $A9 clear start bit check flag, set no start bit yet
FBA5 60 RTS
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