I finally tracked it down to ZP ($94 used in game) item in $FFC0
Code
; send listen on serial bus
ED0C 09 20 ORA #$20
ED0E 20 A4 F0 JSR $F0A4
ED11 48 PHA
ED12 24 94 BIT $94 <<<<<
ED14 10 0A BPL $ED20
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| 94 148[td]Serial bus output cache status. Bits:
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