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1634: THE 'CHANNEL 'K' FLAG' SUBROUTINE
The address of this routine is derived from an offset found in the channel code lookup table.
CHAN_K 1634 SET 0,(IY+$02) Signal 'using lower screen' (set bit 0 of TV-FLAG).
1638 RES 5,(IY+$01) Signal 'ready for a key' (reset bit 5 of FLAGS).
163C SET 4,(IY+$30) Signal 'using channel 'K'' (set bit 4 of FLAGS2).
1640 JR CHAN_S_1 Jump forward.
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