[NTLK] Need help with finding chips for eMate memory upgrade boards

[Randy Glenn]

Flash datasheet: http://randyglenn.ca/newton/28F016SV.pdf
RAM datasheet: http://randyglenn.ca/newton/HM51W16165.pdf

Schematic I reverse-engineered of the NewerTech memory module:
https://github.com/OpenNewt/Memory300/blob/master/memory-300.pdf

Based on
https://web.archive.org/web/20010212135752/http://user.chollian.net/~cehz/upgradeEng.htm
(Newton 2000 memory upgrade instructions, but I assume the eMate 300 will
be the same because they're both N2-based), the salient specs for the RAM
are:
-3.3V
-1M x 16
-4K refresh (determines the number of row address lines vs. column address
lines)
-EDO or Fast Page Mode

1K refresh parts seem to be far more available these days. It's possible
that the eMate will be able to detect that the RAM uses 10 row address pins
and 10 column address pins, rather than 12 and 8 in the 4K refresh parts,
but without more documentation it's hard to know without actually building
it.

-Randy

On Tue, May 1, 2018 at 7:07 PM, NewtonTalk <newtontalk at pda-soft.de> wrote:

> Hi folks,
>
> I finally found the time to open David's parcel that has been sitting next
> to my workbench since January 10. More on this later.
>
> Here's a scan of the EM300 board:
>
> <http://www.pda-soft.de/common/img/hardware/eMate/em300/EM300Board.jpg>
>
>
> 28F016SV  is a 16-MBIT (1 MBIT x 16, 2 MBIT x 8) flash memory chip.
> 51W16165LTT6 is probably a RAM chip.
>
> It would be cool if someone could locate
>
> a) the datasheets of these two chips
>
> b) a source that still sells them (very unlikely you'll find one, I'm
> afraid)
>
> c) A chip that has more memory, but basically the same electrical
> specification and the same timing specification. Such a component is likely
> to have at least two more address line pins, which would not be a problem.
> Would be cool, however, if the pins they have in common are at the same
> place so that we wouldn't have to re-layout everything.
>
> Thanks
>
> Frank
>
> -- Newton software and hardware at http://www.pda-soft.de
>
>
>
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