HP-21MX bootstrapping?

Glen Slick glen.slick at gmail.com
Sat Feb 23 10:17:10 CST 2008

On Fri, Feb 22, 2008 at 11:29 PM, Tim Riker <Tim at rikers.org> wrote:
> Well, you were close. :) The card edge connector from the cable on the
> front panel has some pins that barely touch. To confirm I swapped (shh!)
> the front panel from the 2112 with the 2108. Sure enough, now the 2108
> will IBL, and the 2112 will not.
> Anyone recommend a place to order a replacement the 50 pin card edge
> connector?

What is on the other end of the cable with the 50-pin card edge
connector?  Is that somewhat permanently attached to the front panel?
I just took a quick look at a 2113B front panel and without
dissasembling it or taking a close look it appears it might be
permanently attached.  If you can't easily remove the whole cable and
make an equivalent new cable, there might be enough extra length in
the cable to cut of the bad connector and press on a new 50-pin card
edge connector.

If you haven't built any IDC cables I wouldn't recommend trying it on
the permanently attached front panel cable the first time you try
until you know you'll get good results.  The first couple of times I
tried building some IDC cables without proper tools I ruined a couple
of connectors and a couple of inches of cable.  Then I acquired some
proper IDC press tools and built a couple of sets of Pertec tape drive
cables with 50 conductor ribbon cable and IDC headers on one end and
card edge connectors on the other without too much trouble.

I bought some part# 15-CE50 at www.emtel.com and I think they were
cheaper a few months ago there than they are today.  Now they list
them as $26.90 for q10.

Still cheaper than Digi-Key
Digi-Key: CW CCE50S-ND $5.89, 3M MCE50K-ND $11.67

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