Sencore VA62&VA62A Modifications

[Notimetolooz]

An excellent modification to the Sencore.
Very commendable work developing the mod and the wright-up.
I would add some ESD (electrostatic discharge) precautions to your posts, especially for people doing the modification during dry air conditions like the winter. One of those grounded wrist straps is a good idea, as well as working on a conductive ESD matt. The screwdriver blade you show prying the EPROM out should be in contact with your finger or grounded some other way. I think some parts of this vintage are particularly prone to damage.
Another technique I use to catch the metal fragments when drilling is to use a lump of modeling clay stuck to the back of the panel. It may leave a smudge when remove, but it will catch more.

[Sparky]

I tried both of your hex files, but neither works on the VA62.
My original Sencore VA62 EPROM 69G94-6, has the data starting at 800-FF7, while your v1 has data from 000-7FF.

All this is seen using a Minipro. All files burned to a 2732. µP for both is an Intel 8035AHL

Is there something I am missing as to why v1 doesn't work on the VA62?

Meanwhile at the same time, I am also working on an RF output dead, VA62A.
The Original VA62A EPROM 69G94-21, has its data starting at 000-9FF.
Your v1, starts at 000-7FF. Less data?

v1 works in the VA62A, however v2 does not.
v2 has data going all the way from 000 to FFF.
I didn't think that the VA62A needed the extra address line since it was a 2732.
All non functioning occurrences above, don't boot at all. Just 8888 and garbage.

Please help.

I knew I kept that UV eraser for a reason!

[Sparky]

I just did an edit to v1 and set its start at 800 and it works!

Here for your examination, the modified file.