Re: Tron ROM D6

-----Original Message-----
From: EvilJim <eviljim13@comcast.net>
To: rasterlist@vectorlist.org
Date: Tue, 06 Nov 2007 10:09:44 -0800
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 <http://dkc3.digikey.com/PDF/T073/0921-0922.pdf> 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.
>
cmos is better,
less power, less heat, and they arent sensitive like the old 40 series logic was - trust me.

> 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?
>

you cant have a chip too fast, that's the maximum speed, it runs at whatever speed it's accessed.
the lower the number the faster it is and as long as the number is equal or lower than the original it's fine.
get the 100ns, it's a good chip, the 150 is too slow if you want to re-use it in something newer.

> 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.
>
>
cover the window however you like,
if you want to lift the old sticker with a blade & glue it down then fine.
or scan it and print it onto a label-sheet

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Received on Tue Nov 6 16:02:28 2007