Add-on card edge fingers for mock S-100 boards
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
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@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
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 Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos -----Original Message----- From: vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org> On Behalf Of Adam Michlin via vcf-midatlantic Sent: Thursday, January 13, 2022 1:09 PM To: vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Cc: Adam Michlin <adam.michlin@vcfed.org>; Herb Johnson <hjohnson@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@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
On Thu, Jan 13, 2022, 11:02 AM Herb Johnson via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
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.
Josh's "Sea of Plated Holes" Board tries to address this by offering only a row of 74LS245 bus transceivers therefore maximizing the prototyping area. See here for an illustration => < http://s100computers.com/My%20System%20Pages/Mini%20Buffered%20Prototype%20B...
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
It was my understanding that only the Altair backplane had a different row spacing for it's connectors. Everything that I have seen since (IMSAI, Ithaca, TEI, CompuPro, Cromemco) used the same .250 row spacing. Regards, Jeff
It was my understanding that only the Altair backplane had a different row spacing for it's connectors. Everything that I have seen since (IMSAI, Ithaca, TEI, CompuPro, Cromemco) used the same .250 row spacing.
The Byte Shop BYT-8 and Polymorphic Poly-88 both use the narrower spacing too. I don't know if later Polymorphic systems do too. There are probably others. Haven't checked on my TDL stuff. Thanks, Jonathan
Jonathan & Herb, Thanks for clarifying. I knew the pin to pin spacing was .125” but I thought the Altair was the only system that used the narrow row spacing. I learned something today. Regards, Jeff On Fri, Jan 14, 2022 at 11:31 AM Jonathan Chapman via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
It was my understanding that only the Altair backplane had a different row spacing for it's connectors. Everything that I have seen since (IMSAI, Ithaca, TEI, CompuPro, Cromemco) used the same .250 row spacing.
The Byte Shop BYT-8 and Polymorphic Poly-88 both use the narrower spacing too. I don't know if later Polymorphic systems do too. There are probably others. Haven't checked on my TDL stuff.
Thanks, Jonathan
participants (5)
-
Adam Michlin -
Herb Johnson -
Jeff Galinat -
Jonathan Chapman -
W2HX