Hi John! It's quite understandable what you did and i'm surely not in a hurry: I have a huge pile of boards to build right now.
I'll get them when ready! Fabio On Jun 7, 2014 5:27 AM, "John Monahan" <[email protected]> wrote: > David, Fabio, Elsid, Edward, Vince, nbreeden (if I left anybody out > please let me know), on this 80386 S100 board and the two associated RAM > boards (8MB & 32/64MB capacities) I have decided to just do a run for > myself first, (4 of each). Went with PCBCard (over $500). While the > changes to the last prototype were very minor as were the changes to the > RAM boards, I did "play around" with them with KiCad & Freerouter here, > (Normally Andrew handled this stuff), I just could not sleep at night > ordering such a large batch of stuff worrying that that bugs crept in. > This way only I take the hit. They should be here within two weeks or so. > Stay tuned > > > > John > > > > > > > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *David Fry > *Sent:* Thursday, May 29, 2014 12:16 AM > *To:* [email protected] > *Subject:* [N8VEM-S100:3814] Re: An 80386 master/Slave CPU baord with 8 > or 32 MB Static RAM boards > > > > 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:- > > > http://s100computers.com/My%20System%20Pages/80386%20Board/80386%20CPU%20Board.htm > > > > 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:- > > > http://s100computers.com/Software%20Folder/80386%20Monitor/80386%20Monitor.htm > > > > 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:- > > > > > http://s100computers.com/My%20System%20Pages/80386%20-%208MG%20RAM%20Board/8MG%20Static%20RAM%20Board.htm > > > http://s100computers.com/My%20System%20Pages/80386%20-%2032MG%20RAM%20Board/32MG%20Static%20RAM%20Board.htm > > > > 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 > > > > > > > > > > > > > > . > > -- > 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. > -- 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.
