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View Full Version : CorComp 9900 Disk Contoller Repair kit?



SomeGuy
March 7th, 2018, 01:46 PM
I stumbled on this auction for a set of chips for use repairing a CorComp 9900 DSDD TI-99/4a disk controller:
https://www.ebay.com/itm/CorComp-Double-Sided-Double-Density-Disk-Controller-Repair-IC-Kit/152785506426

This interests me because I have a dead CorComp FDC that I have been meaning to get repaired if possible. I was hoping to find someone who could test the PALs, but that has not happened yet.

The auction lists two PAL chips, but seems to indicate they are identical, suggesting they are blank, unprogramed, PALs.

I was under the impression no one had managed to dump the contents of these PALs yet. Has someone managed to do that? Or are they just including them for the possible future?

Ksarul
March 7th, 2018, 06:49 PM
The PALs are definitely blank, as CorComp always blew the fuses on their PALs, no known copy of the equations survives, and no one has taken the time to try and do a definitive I/O logic test to try and reconstruct them. The price for the kit still isn't bad, as long as all of the chips are good.

barryp
March 11th, 2018, 05:39 PM
I bought a couple of those kits but haven't done anything with them yet. (I'm slow...)