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Re: [N8VEM-S100:5656] Re: EPROM/RAM board

John:  You mean "RAM+PROM" according to your page-URL (although "RAM+ROM Board" in your list).  There are come confusions here, yes ...

I have a board that sound like Rich's, although the UL number is 4413.  An identifying characteristic is that it appears that the "8CS*" pin at the bottom of RR4 is unconnected.  The VERSION 02 board appears to have it routed across the very top edge of the front face of the board over into the region of U25.  Also there is no K4 left of P30 on the VERSION 01.  Your online pics are internally consistent with the two VERSIONS, and http://s100computers.com/My%20System%20Pages/RAM+ROM%20Board/S100_EPROM%20V2-sch%20%28Jumpers%29.pdf shows VERSION 01 (no K4).

Your BOARD LAYOUT is a VERSION 01 board, and I think that's also true for the BOARD SCHEMATIC as I can't find a K4 on it either.  (the fine grey print does only claim V1.0)

So I think that's what is missing are the VERSION 02 board/schematic files (and BOARD JUMPERS DIAGRAM?), and the documentation for what's changed in V2 needs to mention the use of K4 and the new trace to the pull-up in RR4.  These probably fall under your reference to "Some other minor changes/jumpers were added as well".

Then folks like Rich/I can decide whether to field-mod our VERSION 01 boards to VERSION 02 conformant :->.

Many thanks for throwing some insight/light onto this matter John!

On Sat, Nov 22, 2014 at 3:45 AM, monahanz <mon...@vitasoft.org> wrote:
Rich if it has a coin battery and gold fingers that is the only one made. How is your board differing from the web site.  There was an older version of these boards but these we called ram/rom boards.  the newer ones are called ram+rom. See the "new boards" section of s100computers.com.

On Friday, November 21, 2014 7:56:53 PM UTC-8, AltairManRich wrote:
All — 

I was going to build the EPROM/RAM board this weekend but I noticed that there are several versions of the board. Mine says “4213” by the UL designation in the upper-left corner and has “Version 01” in the lower-right corner. It also has a coin cell battery holder on it.

This version doesn’t match any of the pictures on the Web site so before I built it, I wanted to confirm it was a good version. If not, I guess I should get another one from Ed Snider (I think).



Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator

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