IFNZ, ( buffer full? )
( no, continue )
DE ADDHLd, ( restore ACIAW> )
( buffer not full, let's write )
ACIA_IO INAi,
(HL) A LDrr,
( advance W> )
HL INCd,
( +2 == ACIAW> )
ACIA_MEM 2+ LD(n)HL,
( +6 == ACIA) )
DE ACIA_MEM 6 + LDdd(n),
DE SUBHLd,
( cont. )