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Re: [N8VEM-S100:3812] An 80386 master/Slave CPU baord with 8 or 32 MB Static RAM boards
If you're looking for someone to do a larger board order (of the 80386
board and the two SRAM boards) I'm happy to do so.
If not, then I'm interested in three of each of the boards.
* monahanz <mon...@vitasoft.org> [140529 00:59]:
> Well it looks like it's finally done. After some 6 prototype boards and one
> year later it looks like we now have a completely functional S100 bus 80386
> board. This board runs on a 21 slot motherboard at 9MHz for all
> interrupts, I/O ports and RAM from 0 to 16MB. For the remaining RAM (up to
> 4GB for the 80386) the CPU runs at 36MHz (in pipeline protected mode) and
> 32 bits wide via two above board cable connectors.
> A complete description of the board can be found here:-
> There is also a short video of the board in operation towards the bottom of
> the page.
> A major component of this effort was writing the 80386 monitor. It's in
> fact surprising how little example code there is out the demonstrating the
> setting up the 80386 to switch from real to protected mode. This is
> written up here:-
> The board currently works with two static RAM boards that sit in the bus
> but communicate directly (and only) with the 80386. The capacity of these
> boards are 8 and 32 MB's. These are described here:-
> A big thanks goes out to Andrew Lynch at N8VEM (
> http://n8vem-sbc.pbworks.com/w/page/4200908/FrontPage) for laying out the
> many prototypes these boards took. Thanks Andrew.
> I will be ordering a few "commercial quality" boards for myself. If
> anybody else would like one of these boards they can let me know. *However
> be aware that these boards are not only complex but expensive to build*.
> The boards themselves are the smallest part of the whole equation. The 8MB
> static RAM board is a rock solid board and great for testing out the
> hardware and software but those Alliance Memory Inc. 512x8 static RAM
> chips cost about $20 each. The 32MB board on the other hand has 4 times
> the capacity for about the same price but uses SMD chips.
> Next up is an 80486 board and the real challenge a 4GB DRAM board!
> John Monahan
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