Routines
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EF3B: set VIA 2 ICR from A
Used by the routines at EF7E, F028 and F04D.
EF3B 8D 0D DD STA $DD0D save VIA 2 ICR
EF3E 4D A1 02 EOR $02A1 EOR with the RS-232 interrupt enable byte
EF41 09 80 ORA #$80 set the interrupts enable bit
EF43 8D A1 02 STA $02A1 save the RS-232 interrupt enable byte
EF46 8D 0D DD STA $DD0D save VIA 2 ICR
EF49 60 RTS
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