collapseos/blk/626
Virgil Dupras 43eabf566b sms: WIP !
2020-05-14 22:15:31 -04:00

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: _zero ( x -- send 0 _data x times )
( x ) 0 DO 0 _data LOOP ;
( Each row in ~FNT is a row of the glyph and there is 7 of
them. We insert a blank one at the end of those 7. For each
row we set, we need to send 3 zero-bytes because each pixel in
the tile is actually 4 bits because it can select among 16
palettes. We use only 2 of them, which is why those bytes
always stay zero. )
: _sfont ( a -- Send font to VDP )
7 0 DO C@+ _data 3 _zero LOOP DROP
( blank row ) 4 _zero ;