I finally got a chance to build a second REX tonight on my own (kids are off at
their mother's house for the weekend).
Two wins: first of all, the voltage regulator I thought I messed up last time
is actually OK, and I was able to straighten the pins, solder it down to a
fresh PCB (along with C4) and give it a functionality test.
Second, I thought I'd try out one of the MX29F800CBTI-70G chips I ordered from
Digi-Key last time, and it works perfectly. I've loaded every ROM image I can
find and a bunch of my RAM images from VirtualT into it and so far no problems
switching between any of them. I'm not sure what else needs testing to verify
it, but I was honestly half expecting it to barf when I tried installing the
REX software load.
The chip is a Macronix MX29F800CBTI-70G and the Digi-Key part number is
1092-1022-ND. They're not quite as cheap as buying the AMD chips in lots of 10
off eBay, but for someone who just wants to build 1-3 REX modules for their own
use I thought it might be convenient to not have to place an order with another
parts supplier or from China to get a couple of flash chips.
Brian, I could add a mention of this to the Building a REX wiki page, or leave
it for you to add if you prefer. I don't know if it would be nicer to make it
part of the pre-loaded Digi-Key cart you linked to, or just mention it
separately.
jim
