Routines
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EEA9: get the serial data status in Cb
Used by the routines at ED40, EDCC and EE13.
EEA9 AD 00 DD LDA $DD00 read VIA 2 DRA, serial port and video address
EEAC CD 00 DD CMP $DD00 compare it with itself
EEAF D0 F8 BNE $EEA9 if changing got try again
EEB1 0A ASL A shift the serial data into Cb
EEB2 60 RTS
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