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