I was thinking of playing MS-DOS games at full 386 speed but with the I/O being S100 bus bound I'm not sure how well that would work over the S-100 bus vs ISA. I know people have run the S-100 bus up to 10 Mhz and the main thing going over that would be an MS-DOS compatible VGA card which also worked on the ISA bus at 8 MHz so maybe it would work?
I have this idea of many years and hours of free time from now being able to play Wing Commander on a full homebrew computer build. I guess it might be "better" to design a 386 CPU board (or board set) for Sergey's ISA backplane (maybe with an over-the-top RAM connection similar to how you've implemented it) and be a bit more IBM PC-like.... Andrew B On Tuesday, July 22, 2014 9:34:16 PM UTC-7, monahanz wrote: > I had not considered that Andrew, mainly because you need the two real > mode ROM’s to get going. You would have to either make a daughter board > with (optimally) EEPROMS and place it at FFF000H or have RAM at that > location, boot from the S100 bus, copy the real mode ROM to the to the top > of the 4GB and go from there. However in all case remember I/O is S100 bus > bound. > > It may be possible to rig up something with the current board controlling > P20 pin 2,4 from a port (high inactivates S100 Access). I will definitely > look into it for the 80486 board. > > > > John > > > > > > > > *From:* [email protected] <javascript:> [mailto: > [email protected] <javascript:>] *On Behalf Of *Andrew Bingham > *Sent:* Tuesday, July 22, 2014 8:25 PM > *To:* [email protected] <javascript:> > *Subject:* [N8VEM-S100:4672] Re: S-100-16M-SRAM-MEZZ-V6c Board - Status > --- OK > > > > Good to know they checked out. Not quite sure if I am ready to solder > those yet, until I "need" them to go with the 386 board. > > > > A question John - is it possible to tell the 386 board to go access ALL > it's RAM on the Mezzanine/over-the-top-cable cards, so it stays in the > "fast" mode vs having the first bit of RAM on the S-100 bus? > > > > Andrew > > On Tuesday, July 22, 2014 6:09:44 PM UTC-7, monahanz wrote: > > Todd just a quick note to let you know the V06c version of the mezzanine > boards checked out fine on the 16MG S100 RAM board. I hammered them > fairly good with the 80386 board, they did fine. > > > > Soldering the chips on to the board is quite tricky. I found it best to > aligen one corner, then orientate the chip and do the diagonally opposite > corner, then run the salder tip along the pins. With a wet tip there is > enough solder on the pins and the board for contact. However I had one > chip where the pin did not make contact, took me a while to locate it. > These boards are definatly not for anybody with shakey hands > > > > Will next do the 32MB 80386 board, but for now I feel confident sending > them out to all 16MB board users. > > > > Thanks Andrew and Dave for all your help on these. > > > > > > John > > > > -- > 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] <javascript:>. > 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.
