If Andrew puts up the board files for this RAM+ROM board on the Wiki site. Before another run is done, could somebody volunteer making the small changes (below) and do the board re-routing etc. It will make for a much nicer board.
1. Connect pin 12 of U1D to pin 6 of P31 2. Have ground pin option for pin 20 (CE) of U123 3. Change the order of pins on K2 to avoid the need for wire-wrap 4. Remove bA14 label on U100 and U101 and join U100 pin 28 to U101 pin 28 (both go to P14,7). I would do it but I’m busy finishing an 80386 board and a few other things John From: [email protected] [mailto:[email protected]] On Behalf Of Tom Lafleur Sent: Sunday, May 11, 2014 12:52 PM To: [email protected] Subject: Re: [N8VEM-S100:3631] New run of S-100 EPROM/RAM boards... I'll take two also... On Sun, May 11, 2014 at 12:18 PM, curt mayer <[email protected]> wrote: I you're doing a run of the one with the battery backup, put me down for two. On Friday, May 9, 2014 9:44:08 AM UTC-7, Edward Snider wrote: These are tweaks for the newer "RAM & ROM" board? That's the one we are going with (the one with the battery). I didn't realize there was an improved board at first. Hopefully Andrew has time make these changes. Ed On Friday, May 9, 2014 11:29:34 AM UTC-5, monahanz wrote: Guys that board has been superseded by the “RAM & ROM” board. See here:- http://s100computers.com/My%20System%20Pages/RAM+ROM%20Board/RAM+PROM%20Board.htm There is nothing particularly wrong with that board (except it is somewhat a bit of a pain to figure out the correct jumpers) but the newer board has things much more organized and has onboard battery backup capability for the static RAM. While it is fine as is, there are a few really minor tweaks that would be nice:- 1. Connect pin 12 of U1D to pin 6 of P31 2. Have ground pin option for pin 20 (CE) of U123 3. Change the order of pins on K2 to avoid the need for wire-wrap 4. Remove bA14 label on U100 and U101 and join U100 pin 28 to U101 pin 28 (both go to P14,7). If Andrew has time to splice these in, it might be worth waiting for. If so let’s call this board “V2 “ John -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout. -- ~~ _/) ~~~~ _/) ~~~~ _/) ~~~~ _/) ~~ Tom Lafleur (858) 759-9692 -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
