RE: Tron ROM D6

I've never had a problem using CMOS versions of EPROMs on most boards,
though I've never tried them in a _Tron_; that's a machine I don't have a
great deal of experience with. I like using them when possible because they
consume less power, which therefore lightens the load on the power supply.

Have you tried placing the original EPROMs face-down on your scanner? You
can digitally preserve them that way... and perhaps even print out new
copies later.

I don't think you'll have difficulties with a "too fast" chip.

End of line.
Matt J. McCullar
  -----Original Message-----
  From: owner-rasterlist@vectorlist.org
[mailto:owner-rasterlist@vectorlist.org]On Behalf Of EvilJim
  Sent: Tuesday, November 06, 2007 12:10 PM
  To: rasterlist@vectorlist.org
  Subject: RASTER: Tron ROM D6

  Thnx for the image, Peter. Using the EPROM programmer yesterday indicated
two locations to have discrepancies in a Compare with the new image. Looks
like I have a bit of rot in that ROM. (Oh man, "bit of rot", I slay myself.
=) )

  Yeah, anyways...as for getting new chips to burn, will a CMOS replacement
be an issue? I believe I have found a such a beast in the 27C64 at
Digi-key, second section header, first page. However, I didn't know if they
were good choices or if they should be avoided. (IIRC, CMOS are very ESDs,
not sure if there are other concerns.) Of course there are all the pulls
available online, but we have the DigiKey catalog in the lab, so I looked
there first.

  Also, I was unsure about chip speed and possible errors/problems if I were
not to make sure I matched the original spec. There are three speeds avail
(100ns, 150ns, 200ns) but I was unsure how to determine what speed my
current EPROM is running at. I recall reading issues with memory speeds,
but IDK if it was in connection with MCR games or another system. No luck
finding it in my searches yesterday. If I just get the fastest option,
would that cover all bases? Or are there issues generated by a "too fast"
chip?

  On a related but nit-picky note, any tips on preserving the original
window stickers from the ROM? I'll need to pull it in order to erase, but
it seems so sad to lose it, given that it is clearly original. Won't do me
any good with the tape damaged ones, but oh well.

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Received on Tue Nov 6 20:41:58 2007