17 Nov
2008
17 Nov
'08
2:24 p.m.
On 17 Nov 2008 at 18:55, Tony Duell wrote:
Is there anything else in the nnit apart from 1488s
and 1489s and PSU
parts? Any logic?
Is there any maker's name on the unit or on the PCB?
Tony, from the photos, it's a homebrew, built on a piece of
protoboard with hand wiring between the pads. No other logic, just
1488/89 ICs, which means that a supply of +/-12 or so had to come
over the cable.
Being homespun, it's hard to say what this might fit, although a
serial adapter for an early printer (the Epson MX-80, for example,
was sold with only the parallel adapter, even though serial comm
logic was present. The "serial" board was pretty much just level-
shifting to RS-232 levels.
Cheers,
Chuck