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Re: [N8VEM-S100:1238] S-100 board reorders

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.


----- 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. 


----- 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. 


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Tom Lafleur 
(858) 759-9692