$0297/663:   RS232 Pseudo 6551 Status Register Image

Kernal-Reference:

 LDA $0297   : $F086 $F1C1 $FE0D
 ORA $0297   : $EF33 $EFD2
 STA $0297   : $EF36 $EFD5 $F00F $F093 $F09E $FE13
 STY $0297   : $F40C

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