New pcb design for S-100 prototype board available - test-drb@ccmp.vtda.org

3 Jun 2007

...

Subject: RE: New pcb design for S-100 prototype board available
   From: "Rod Smallwood" <RodSmallwood at mail.ediconsulting.co.uk>
   Date: Sun, 03 Jun 2007 15:20:47 +0100
     To: "General Discussion: On-Topic Posts Only" <cctech at
classiccmp.org>

Hi
  Thanks for the positive feed back. Needless to say like all standards
S100 had different versions.
For example the Northstar Horizion had some active components on the
mother board.  
The fact that the mother board had IO on it was a savings of a card or two
but made NO difference to S100 standards.  The variation of standards
were around timing, use of some specific pins, how memory extension (>64k)
was done and the troublesome DMA.

...
 However if we look at a basic passive (other than
power) back plane. 
What are the potential problems? Firstly the connectors are they
available? They had two rows of fifty connections. 
Spacing pin to pin .125in. Mother board was thicker than the usual 1/16
in for rigidity possibily 3/32 in. 
Card guides pretty standard but how high? Then the metalwork supporting
the card guides. 
Generally backplanes were passive and interchangeable excluding mechanical 
differences that were generally small.  Some however included termination
and that was a plus as S100 can ring badly.

...
 Possible Parts List

1.	Double sided S100 motherboard (Say twelve slots)
2.	Aluminium base plate drilled for backplane and card guide
supports.
3.	Twelve double sided 2x50 edge connectors.
4.	Card guide support frame.
5.	Twenty four card guides.
6.	Nuts, bolts and screws etc. 
An outercase..

Power supplies in the case.

Fans!  Lots of fans!

Allison

...
 Rod Smallwood

-----Original Message-----
From: cctech-bounces at classiccmp.org
[mailto:cctech-bounces at classiccmp.org] On Behalf Of Dan
Sent: 03 June 2007 12:59
To: On-Topic and Off-Topic Posts
Subject: Re: New pcb design for S-100 prototype board available

Rod,

I see what you mean. I'm just starting off small right now since it's
mainly a hobby. It's mostly to support the existing vintage computers
out there. I really don't know what the demand there is for a new S-100
chassis. I suppose that might be a good kit to build with the right
parts. I can look into this.

=Dan

[ My Corner of Cyberspace http://ragooman.home.comcast.net/ ]

Rod Smallwood wrote:
  Prototype boards are nice but whats really needed
is an S100 card cage with back plane and PSU.
  Its normal to build the foundations before the
rest of the house!!

 Rod Smallwood