parallel printers driving distance on 3B2s

[H. L. Rogers]

In article <1505 at nis.NIS.MN.ORG> pnessutt at nis.NIS.MN.ORG (Robert A. Monio) writes:
>In article <57 at vsi.UUCP> friedl at vsi.UUCP (Stephen J. Friedl) writes:
>>     Has anybody had experience driving a parallel printer
>>any distance with a standard 3B2 PORTS card?  I know you're
>>not supposed to go very far but I wonder how far that is.
>>I am thinking about 30-40' or so....
>
>We originally had a 3B2-400 here and had our printer(s) connected in
>parallel.  The length of the cable was about 12 feet.  We found that
>
>Later, when we replaced our 3B2-400 with several NCR Tower 600's, we
>were faced with the problem of extending our printer lines to about
>200 feet.  We solved this problem by purchasing a several Parallel Boosters.

Parallel printer cables carry standard TTL logic signals, which can only
drive 12 feet of wire safely while maintaining adequate signal margins.

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