Facit 4070 to PC interface

curiousmarc3 at gmail.com curiousmarc3 at gmail.com
Sun May 8 12:21:12 CDT 2016

Thanks for the link! I didn't know about it. Looks like a pretty straightforward trick, very helpful.

> On May 4, 2016, at 8:32 PM, Bob Rosenbloom <bobalan at sbcglobal.net> wrote:
>> On 5/4/2016 5:52 PM, Charles Dickman wrote:
>> Has anyone ever worked up a PC parallel port to Facit 4070 paper tape
>> punch interface?
>> I found one on a Swedish website. The punch parallel input looks like
>> it is TTL compatible, but I can't find anything in the documentation
>> that describes the input voltage specifications.
>> Chuck
> Check this link out:
> http://www.chiark.greenend.org.uk/~pmaydell/misc/cardpunch/dongle.htm
> It shows how to build a PC to 4070 interface. Basically inverting a few signals.
> Bob

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