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May I add a 5th item to the list of changes?
5. Move the various silk screen labels of chips out from under the chip. When the board is built, you should still be able to identify where U1 is, etc. While your at it, add descriptions of the jumpers on the silk screen (if possible). From: n8vem...@googlegroups.com To: n8vem...@googlegroups.com Subject: RE: [N8VEM-S100:3635] New run of S-100 EPROM/RAM boards... Date: Sun, 11 May 2014 18:25:38 -0400 Hi KiCAD EDA files here
http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder¶m=S-100%20EPROM
Thanks and have a nice day!
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of John Monahan
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 P312. 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: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Tom Lafleur
I'll take two also...
On Sun, May 11, 2014 at 12:18 PM, curt mayer <cu...@zen-room.org> wrote: I you're doing a run of the one with the battery backup, put me down for two.
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
Guys that board has been superseded by the “RAM & ROM” board.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
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