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E4D3: flag the RS232 start bit and set the parity
Used by the routine at EF90.
E4D3 85 A9 STA $A9 save the start bit check flag, set start bit received
E4D5 A9 01 LDA #$01 set the initial parity state
E4D7 85 AB STA $AB save the receiver parity bit
E4D9 60 RTS
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