Yes, that's probably better and likely to remain useable for a long time, but I
was focused on the socket size. It's pretty easy to hack the board, but
building a daughterboard is somewhat more work than hacking the PCB. If wanting
a place to put a 27C512 (also 28-pins) is a problem, a mezzanine board on the
CPU socket might work, too. Then the EPROM board can be sold on eBay to a
"collector" who won't care what it is, and will pay enough to buy a new car ...
well, maybe a new card ...
Dick
----- Original Message -----
From: "Tony Duell" <ard_at_p850ug1.demon.co.uk>
To: <classiccmp_at_classiccmp.org>
Sent: Saturday, June 09, 2001 2:52 PM
Subject: Re: IMSAI EPROMS
> >
> > It's probably not a bad idea to modify the EPROM board to accept the
> > single-supply (Intel-style) 2716, or even 2732. It's not difficult, and,
once
>
> What I would do is make a little daughterboard to take a 27(C)64. It's
> not hard -- most of the pins are in the same place (address, data,
> ground), so it's not hard to do even using stripboard. That way you keep
> the EPROM board original (although I probably would replace the EPROM
> sockets with turned pin types).
>
> 24 pin EPROMS, even the 2716 anmd 2732 are getting hard to find in the
> UK, and are somewhat expensive. 2764s are available everywhere and are
> cheap. And _every_ modern programmer can handle them (I've seen a few
> programmers that can handle nothing smaller than the 2764).
>
> It may seem a waste to replace a 1K*8 chip with an 8K*8 chip, but that's
> progress,,,,
>
> -tony
>
>
Received on Sat Jun 09 2001 - 17:12:02 BST