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ABB5: close input and output channels
Used by the routines at AA80 and ABBF.
ABB5 A5 13 LDA $13 get current I/O channel
This entry point is used by the routine at AB7B.
ABB7 20 CC FF JSR $FFCC close input and output channels
ABBA A2 00 LDX #$00 clear X
ABBC 86 13 STX $13 clear current I/O channel, flag default
ABBE 60 RTS
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