$B4/180:   RS232 Write bit count/Tape Read timing Flag

Kernal-Reference:

 DEC $B4     : $EECD $EEE7 $EEEE
 INC $B4     : $EEF2 $EF00
 LDA $B4     : $EEBB $F98B $F9AC $F9FC $FA14 $FA2F
 STA $B4     : $F854 $FA42 $FA4C
 STX $B4     : $EF1C

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