I did build that board, but could never get
it to take a deposit from the FP and from
what I remember, there was something about
'every other' address step that was not displaying
the data from memory properly.
It's a complex board and I think my problem is in
the 8/16 bit switching and the fact I truly don't
understand it.
The Eprom portion works. I burned the
'walking lights' program and it runs fine.
I have repaired my S-100 boards and built the
SMB with success. However, I'm not an engineer.
I'll have to put it in tomorrow to refresh
my memory.
I was looking for a bare bones circuit just
for 64K. I have one Imsai that I'd like to
sell and it's RAM boards are flaky.
Todd
----- Original Message -----
From: "Tom Lafleur" <laf...@lafleur.us>
To: n8vem...@googlegroups.com
Sent: Monday, December 31, 2012 6:06:00 PM GMT -06:00 Central America
Subject: Re: [N8VEM-S100:1238] S-100 board reorders
just use the rom/ram board... cheap to build and 64k or more of fast ram
On Mon, Dec 31, 2012 at 3:39 PM, < litte...@mchsi.com > wrote:
I'm interested in building a simple 64K RAM board for
the same reason. I have two Imsai's, both with
multiple RAM card(s) with many memory chips.
If someone could point me to a schematic, I'd
like to build a few. I know Don Caprio mentioned
earlier this year he had a project on the PBworks
page but I don't know where to find it.
I'd like to look at a few designs.
Todd
----- Original Message -----
From: "Crusty OMO" < crus...@hotmail.com >
To: n8vem...@googlegroups.com
Sent: Sunday, December 30, 2012 9:45:54 PM GMT -06:00 Central America
Subject: RE: [N8VEM-S100:1236] S-100 board reorders
Hi Andrew,
Cool, thanks! Just a note on what I'm using the first (buffered) prototyping board for....
It's currently being used as a 64K RAM card in my IMSAI. This was done to establish a working system. I'll be replacing this RAM card with the old RAM cards when I test/fix them.
At that point, I'll repurpose this card to be an 8080 CPU, RAM & I/O card for another IMSAI system I'd like to resurrect.
Cheers,
Josh