collapseos/blk/455

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: BLK! ( -- )
BLK> @ BLK!* @ EXECUTE
0 BLKDTY !
;
: FLUSH BLKDTY @ IF BLK! THEN ;
: BLK@ ( n -- )
FLUSH
DUP BLK> @ = IF DROP EXIT THEN
DUP BLK> ! BLK@* @ EXECUTE
;
: BLK!! 1 BLKDTY ! ;