John That's a wonderfull achievement. Well done. You can also put me down for :
1 x 80386 CPU board and one each of the memory boards 8Mb & 32Mb (with a set of 4 mezzanines). Thanks, Leon Byles. On Thursday, May 29, 2014 2:58:57 PM UTC+10, 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.
