Re: 747 Rom Emulator / design

[rr <RRauscher@nni.com>]

The coating is easily removed with BrakeKleen. Just spray some on
a toothbrush and start working it in. That and a paper towel make
quick work of the coating.

Don't understand the eprom socket problem. I've done two '747s,
and a standard machined pin socket dropped right in.

BobR.

Steven Ciciora wrote:

> I volunteered to lay out a board.  On this board, though, I would like it
> super-simple to read the existing prom, so even the novice can upload
> their bin to the bin archive (if a copy isn't there already).  What do
> people think about using that expansion edge connector?  It's usually
> covered with a clear type of paint.  Anyone try removing it?
>
> I like the idea of dual port ram, but has anyone actually used it in a
> product?  My main concern is it really available today, and will a bunch
> be available two months from now?
>
> Also, someone mentioned making an adaptor pcb to adapt from 0.4" wide 24
> pin socket to a more standard 0.6" wide ZIF socket.  If I make a board for
> the above emulator, I'll make one of these boards too.  I'll have to
> measure my 7747 to see if it will fit (without the zif, just a normal
> machine socket).
>
> - Steven Ciciora
>
> <snip>
>
> >
> > As far as DP ram, IDT makes them and they're really no more complicated
> > than SRAM.  There are two address busses, two data busses, one of each
> > to the EPROM socket and PIC.  As I recall there weren't any contention
> > issues to worry about as far as accessing the same address from both
> > ports since th ECM only reads, never writes.  go to IDTs WWW page and
> > search for IDT7008
> >
> > --steve
>
> <snip>

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