making PT reader, was re:weird find: papertape "patch" puncher

From: ben franchuk <>
Date: Sat Mar 6 01:47:06 2004

Andy Holt wrote:

> One further catch if you are building a tape reader ... or doing a "radical
> rebuild"* on a very old design: make sure that the power to the light source
> is reasonably well smoothed ... an AC ripple here can lead to mysterious
> inconsistencies when trying to read tapes :-)

Bring in the heafy 12 volt power supply and bulb. :)

> * before Tony is inclined to accuse me of vandalism here, I'll mention that
> this "rebuild" took place 20 more than years ago when I acquire a couple of
> old (then!) ex-mainframe tape readers and converted most of the electronics
> from discrete (which I didn't understand) to TTL (which I could get to work)
> to interface to a home-brew 6800 system.

So where does one get a punch cheap too???
Received on Sat Mar 06 2004 - 01:47:06 GMT

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