Routines
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EF7E: setup to receive an RS232 bit
Used by the routines at EF90 and EF97.
EF7E A9 90 LDA #$90 enable FLAG interrupt
EF80 8D 0D DD STA $DD0D save VIA 2 ICR
EF83 0D A1 02 ORA $02A1 OR with the RS-232 interrupt enable byte
EF86 8D A1 02 STA $02A1 save the RS-232 interrupt enable byte
EF89 85 A9 STA $A9 set start bit check flag, set no start bit received
EF8B A9 02 LDA #$02 disable timer B interrupt
EF8D 4C 3B EF JMP $EF3B set VIA 2 ICR from A and return
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