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F1CA: output character to channel
F1CA 48 PHA save the character to output
F1CB A5 9A LDA $9A get the output device number
F1CD C9 03 CMP #$03 compare the output device with the screen
F1CF D0 04 BNE $F1D5 if not the screen go ??
F1D1 68 PLA else restore the output character
F1D2 4C 16 E7 JMP $E716 go output the character to the screen
F1D5 90 04 BCC $F1DB if < screen go ??
F1D7 68 PLA else restore the output character
F1D8 4C DD ED JMP $EDDD go output the character to the serial bus
F1DB 4A LSR A shift b0 of the device into Cb
F1DC 68 PLA restore the output character
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