[vcf-midatlantic] Add-on card edge fingers for mock S-100 boards

W2HX w2hx at w2hx.com
Thu Jan 13 19:50:48 UTC 2022


> I'm still blown away that the RS in RS-232 stands for Recommended Standard... from 1960!

Why? In 1960 it was a recommended standard. In 1984 it was renamed to EIA-232 once the standard was adopted. 

73 Eugene W2HX
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-----Original Message-----
From: vcf-midatlantic <vcf-midatlantic-bounces at lists.vcfed.org> On Behalf Of Adam Michlin via vcf-midatlantic
Sent: Thursday, January 13, 2022 1:09 PM
To: vcf-midatlantic <vcf-midatlantic at lists.vcfed.org>
Cc: Adam Michlin <adam.michlin at vcfed.org>; Herb Johnson <hjohnson at retrotechnology.info>
Subject: Re: [vcf-midatlantic] Add-on card edge fingers for mock S-100 boards

TIL that the S in S-100 stands for Standard. Thanks, Herb!

I guess it could be worse, I'm still blown away that the RS in RS-232 stands for Recommended Standard... from 1960!

          -Adam

On Thu, Jan 13, 2022 at 1:02 PM Herb Johnson via vcf-midatlantic <vcf-midatlantic at lists.vcfed.org> wrote:
>
> > Jonathan Chapman >
> > retrobrewcomputers.org
> >
> > Their boards are high-quality modern production with proper hard gold edge plating ...
>
> It wasn't clear if they (Goodman) is offering what they call 
> "unbuffered" or "plain" S-100 prototype boards. The buffered board is 
> apparently expected to be memory or I/O, not a processor board or 
> bus-controlling board such as a new-designed 8080 board as Joe 
> Giliberti may be considering. And without detailing the differences, 
> there's different flavors of S-100 bus; Joe may desire the earliest 
> kind for IMSAI/MITS operation.
>
> Prices at "auction" for old-stock S-100 prototype boards with no 
> layouts, as old stock commercial products, seem  to be in the $25-$50 
> range plus shipping. The newly produced bare boards at retrobrew, seem 
> to be in that range also. The cheapest possible least-desired old 
> S-100 cards touch that range also, as I've observed. Thus I'd call 
> that range "the bottom" for S-100 boards of any sort.
>
> And it's hard to find S-100 connectors below $10 a pop, for that 
> matter, they are often more. It's not appreciated, that S-100 PC mount 
> connectors came in two pin-widths between the two rows. Different 
> brands of backplanes used one or the other. It's a gotcha to buy the 
> wrong width connectors for a particular unpopulated backplane.
>
> So much for "standard" S-100. ;)
>
> Regards, Herb Johnson
>
> --
> Herbert R. Johnson, New Jersey in the USA 
> http://www.retrotechnology.com OR .net preserve, recover, restore 
> 1970's computing
> email: hjohnson AT retrotechnology DOT com or try later herbjohnson AT 
> comcast DOT net


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