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PostPosted: Fri Jul 03, 2015 11:45 am 

Joined: Mon Jan 23, 2012 11:27 pm
Posts: 147
I have a prototype cart I'm trying to dump and one of the eproms looks like it's failed. The chip is a TC574000AD. There are 4 like chips on the cart and I can read the other 3 fine. My programmer won't acknowledge the last one- I get a "chip not placed" message. The chip appears externally fine, no indication of damage.

The board will boot and run in a SNES and get through the menus ok but flakes out when you get to the first stage, so it appears the SNES can't read that chip either.

Anything I can do with this personally? Beyond that what are high end options for recovery?

PostPosted: Mon Jul 06, 2015 4:29 pm 
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Joined: Sun May 27, 2012 8:43 pm
Posts: 1334
You can get old-school with some LEDs and switches, and read out a bit of data by going through addresses yourself and looking at the data lines for output. That'll let you know if it's doing anything at all, though that's obviously not a sane way of dumping data (unless you are part of a television show called Halt and Catch Fire...).

If the addressing circuitry is not working but the data may be intact, maybe there is some microscope-based solution for reading the data visually off the die. If it's a really interesting important proto then it may be worth it...

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