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Roland Huisman
February 24th, 2013, 04:14 AM
Hello Everyone,

I've just acquired an old Holborn 6100 computer. Besides some usual problems
there are problems with the keyboard. (also a common problem at many computers)

The keyboard is a keytronic branded model. So maybe this keyboard is
also used in other model computers. Most of the keys are working normally.
Some keys do work sometimes, and some don't work at all...

It looks as a capacitive keyboard to me. The key contacts do not conduct.
It seems to be a plastic layer having a conductive layer on it's back.
This conductive layer is damaged by the aged foam on it's back.

Does anyone have a good solution to replace the foam and conductive layers?

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Regards, Roland

alker
February 24th, 2013, 06:56 AM
Hi, the same problem has the Apple Lisa Keyboard and SOL-20 Keyboard and many others. You can build you own replacement foam pads - it is a lot of work but easy to do. Here is an excellent description: http://lisa.sunder.net/Lukes_LISA_keyboard_repair.pdf

By the way I'm happy to see that I'm not the only Holborn 6100 owner ;-) I never tried my machine so far but I have the same configuration with the (smaller) 8 inch drive. A friend of mine has the huge washing-machine type 8 inch drive for the holborne.. but it did not boot anymore.

Roland Huisman
February 24th, 2013, 08:26 AM
Hello Alker,

Thanks for the document! I will try to get the materials.

There is more to do like changing capacitors...
And it needs a good cleaning after all it's years.

I wonder do you or anyone else have documentation about this machine?
My machine originally had a hard disk. A part of the hard disk
controller is still in the machine.

12010

But the interface PCB which was originally in the external box is gone.
The hard disk is gone nd the power PCB is gone.

This is the FDD / HDD case just cleaned ready for reassemble.
I've made some lines to point where the components were.

12012

I presume the power is the same as is in the computer itself :
The size matches perfectly.

12011

I think it's not a problem to get a HDD and this power supply.
But the interface from the 50 pole cable to MFM might be a problem.
Does anyone have a suggestion for a possible standard MFM controller?

If anyone has the documentation I can redesign
this PCB if it's not a standard controller.

Regards, Roland