Routines
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EF90: no RS232 start bit received
Used by the routine at EF59.
EF90 A5 A7 LDA $A7 get the RS232 received data bit
EF92 D0 EA BNE $EF7E if ?? go setup to receive an RS232 bit and return
EF94 4C D3 E4 JMP $E4D3 flag the RS232 start bit and set the parity
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