collapseos/blk/587

: (key)
    ( inc then fetch )
    [ ACIAR> LITN ] @ 1+ DUP [ ACIA) LITN ] @ = IF
        DROP [ ACIA( LITN ] @
    THEN
    ( As long as R> == W>-1, it means that buffer is empty )
    BEGIN DUP [ ACIAW> LITN ] @ = NOT UNTIL
    [ ACIAR> LITN ] !
    [ ACIAR> LITN ] @ C@
;
: (emit)
    ( As long at CTL bit 1 is low, we are transmitting. wait )
    BEGIN [ ACIA_CTL LITN ] PC@ 0x02 AND UNTIL
    ( The way is clear, go! )
    [ ACIA_IO LITN ] PC!
;