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E4AD: open channel for output
Used by the routine at E118.
E4AD 48 PHA save the flag byte
E4AE 20 C9 FF JSR $FFC9 open channel for output
E4B1 AA TAX copy the returned flag byte
E4B2 68 PLA restore the alling flag byte
E4B3 90 01 BCC $E4B6 if there is no error skip copying the error flag
E4B5 8A TXA else copy the error flag
E4B6 60 RTS
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