collapseos/blk/584

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IFNZ, ( buffer full? )
( no, continue )
DE ADDHLss, ( restore ACIAW> )
( buffer not full, let's write )
ACIA_IO INAn,
(HL) A LDrr,
( advance W> )
HL INCss,
( +2 == ACIAW> )
ACIA_MEM 2+ LD(nn)HL,
( +6 == ACIA) )
DE ACIA_MEM 6 + LDdd(nn),
DE SUBHLss,
( cont. )