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Add .frt samples for Forth.

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Lars Brinkhoff
2014-09-30 07:01:35 +02:00
parent 86b4de89bd
commit 7a2be16d77
3 changed files with 23 additions and 0 deletions
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samples/Forth/bitmap.frt Normal file
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\ Bit arrays.
: bits ( u1 -- u2 ) 7 + 3 rshift ;
: bitmap ( u "name" -- ) create bits here over erase allot
does> ( u -- a x ) over 3 rshift + 1 rot 7 and lshift ;
: bit@ ( a x -- f ) swap c@ and ;
: 1bit ( a x -- ) over c@ or swap c! ;
: 0bit ( a x -- ) invert over c@ and swap c! ;
: bit! ( f a x -- ) rot if 1bit else 0bit then ;