New pcb design for S-100 prototype board available

[Allison]

>
>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
>>   
>>   
>
>