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AS= OS= "H"
'-------~
PORT negated
. _ _____ _ _ ____, IOSEL negated
FDCCS negated/
' - - - - - - - 1 i . 1
IOBSEL negated/
IORD/WR negated/
DSACKIO negated
DACK negated
End of cycle
3-3-9.
Centronics (Parallel Port) Access
The parallel (Centronics) port is an output-only 8-bit
parallel interface.
It is principally used to connect a
printer and conforms to the specification developed
by
the
Centronics company.
The signal transition is shown below.
Timing is fixed by
NWS-1500.
CPU side {
DATA
(
)
~
>-
STRB
3useJ
{
BUSY
PRINTER
side
NWS-1510/1530/1580
3-19
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