I understood that John is doing a limited run of all boards too. Let's say I'll get 3x of whatever he builds :-P On May 29, 2014 12:28 PM, "Paul Birkel" <[email protected]> wrote:
> 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 <[email protected]> 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:- >>> 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.
