9 Aug
2019
9 Aug
'19
9:05 p.m.
I have a question about cable length - any electrical engineers in the
house?
Connected a Qualstar 1260 tape drive to an Emulex TC02 qbus tape
controller in a pdp-11/53.? The interface is pertec with 2 50 pin cables.
When I use a pair of short flat ribbon cables, 18 and 30 inches each, it
works.? Under RT11 I can INIT, Copy, DUMP, do a Directory.
It doesn't work when I use a pair of 5 foot long flat ribbon cables.?
Are they too long?? Do I need twisted pair type of cable?? Is it
possibly a termination problem?
Doug