RS232 voltage level converter box

Chuck Guzis cclist at
Mon Nov 17 16:24:16 CST 2008

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.


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