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collapseos/blk/359

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: KEY
( inc then fetch )
ACIAR> @ 1+ DUP ACIA) @ = IF
DROP ACIA( @
THEN
( As long as R> == W>-1, it means that buffer is empty )
BEGIN DUP ACIAW> @ = NOT UNTIL
ACIAR> !
ACIAR> @ C@
;