Probably a stretch but wondering if anyone has any info (manual, pinouts,
service documentation) for a GNT model 3601 8-bit (1") paper tape punch.
It was probably better known in the CNC / automated machining world than
in computing but my hope is to resurrect it as a backup punch for copying
tapes I use with my ASR-33 and thereby save wear on the -33's punch.
The unit has serial and parallel interfaces on DB25 connectors but I do
not have any pinout information for those. The serial one I can probably
Unfortunately, the unit is a little more sick than "works OK" seemed
to imply from the eBay seller. It has what I believe to be a power
supply problem because as soon as you try to punch all eight holes with
the front panel test button, the power LED dims and the punch jams,
apparently from lack of umph to complete the mission. It could also be
jamming to start with and that causes the power drop I suppose.
In any case, looking for any docs before I open it up and start digging
around. I have written to GNT without a reply so far.
mailto:chrise at pobox.com