Yes I’ll be ordering all 3 boards (3 of each). I forgot about the mezzanine RAM boards. I actually don’t need any, they are the sane mini- boards that Todd ordered for the 16M static RAM board.
I guess I should get some more however
John
From: n8ve...@googlegroups.com [mailto:n8vem...@
googlegroups.com ] On Behalf Of Paul Birkel
Sent: Thursday, May 29, 2014 3:28 AM
To: n8ve...@googlegroups.com
Subject: Re: [N8VEM-S100:3814] Re: An 80386 master/Slave CPU baord with 8 or 32 MB Static RAM boards
John: When you say "I will be ordering a few "commercial quality" boards for myself." I'm unsure whether you are referring to only the 80386 board, or including orders for the 8MB and 32MB boards? David obviosuly thinks that you meant the latter :->.
I'd also be interested in some mix of the three, but I'm unclear exactly what your proposal includes/entails?
So I'll toss in a request just like David:
1 x 80386 CPU board and one each of the memory boards 8Mb & 32Mb (with a set of 4 mezzanines)
Yes, either way the cost to populate the memory ICs is expen$ive; the joys of static memory. I think that you meant to say that the Alliance Memory (DIP) works out to about $16 for 4 chips = 2MB -- about the same as one SMD chip of the same aggregate capacity. TANSTAAFL!
On Thu, May 29, 2014 at 3:15 AM, David Fry <dgf...@googlemail.com> wrote:
Hi John,
I would like 1 x 80386 CPU board and one each of the memory boards 8Mb & 32Mb (with a set of 4 mezzanines) as i am undecided at this point which memory board to do. The AS6C4008 DIP chip is the cheaper chip at about £3.00 UK a piece at Farnell.
best regards
David Fry
On Thursday, May 29, 2014 5:58:57 AM UTC+1, monahanz wrote: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!
Enjoy
John Monahan
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