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sms: implement linefeed in VDP

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This commit is contained in:
Virgil Dupras 2020-05-15 16:08:27 -04:00
parent f9a8e6f180
commit 852c775b5b
1 changed files with 10 additions and 2 deletions
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@ -1,6 +1,14 @@
: _cell! ( tilenum pos )
2 * 0x7800 OR _ctl ( tilenum ) _data 1 _zero ;
: _lf
XYPOS @ 0 ( blank ) OVER _cell!
[ VDP_COLS LITN ] / 1+ [ VDP_ROWS LITN ] MOD
[ VDP_COLS LITN ] * XYPOS !
;
: (emit)
XYPOS @ 2 * 0x7800 OR _ctl
0x20 - 0x5e MIN ( tilenum ) _data 1 _zero
DUP 0x0d = IF DROP _lf EXIT THEN
0x20 - DUP 0< IF DROP EXIT THEN
0x5e MIN ( tilenum ) XYPOS @ _cell!
XYPOS @ 1+ DUP [ VDP_COLS VDP_ROWS * LITN ]
= IF DROP 0 THEN XYPOS !
;