2020-05-16 05:41:06 +10:00
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: _updsel ( -- f, has an action button been pressed? )
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_status _prevstat C@ OVER = IF DROP 0 EXIT THEN
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DUP _prevstat C! ( changed, update ) ( s )
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0x01 ( UP ) OVER AND NOT IF 1 _sel +! THEN
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0x02 ( DOWN ) OVER AND NOT IF -1 _sel +! THEN
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0x04 ( LEFT ) OVER AND NOT IF -5 _sel +! THEN
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0x08 ( RIGHT ) OVER AND NOT IF 5 _sel +! THEN
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0x10 ( BUTB ) OVER AND NOT IF _nxtcls THEN
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( update sel in VDP )
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2020-05-16 07:46:18 +10:00
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_chk _sel C@ (emit) -1 XYPOS +!
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2020-05-16 05:41:06 +10:00
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( return whether any of the high 3 bits is low )
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0xe0 AND 0xe0 <
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;
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