Perhaps, the DRAM board is a good one to start with an FPGA to handle the whole DRAM controller so that current memory can be used?
Todd * John Monahan <[email protected]> [140729 19:26]: > I have so far absolutely no experience with Linus Andrew. My very long term > goal is to have it on all of the boards mentioned below, should be doable. > The “Achilles heel” of the 80386 system right now is RAM. I think we can > get to 64MG with the daughter board but that system really requires a SIMM in > the GB range. That will require a difficult board to layout involving a > DRAM refresh circuit. This is currently past my capability and I have > toyed with the idea of offering financial “a reward” to the first person that > provides me with a practical design that I can get to work. Probably later > in the year anyway as the is a backlog right now. > > > > John > > > > > > > > From: [email protected] [mailto:[email protected]] On > Behalf Of Andrew Bingham > Sent: Tuesday, July 29, 2014 1:34 PM > To: [email protected] > Subject: [N8VEM-S100:4731] Re: An ARM CPU on the S100 bus > > > > John, > > > > I was trying to find information the other day on historical ARM CPUs > thinking about this as well. > > > > One thought though - would writing Linux drivers to use the GPIO pins on this > module to interface with the S-100 IO boards be more or less difficult than > writing Linux drivers to be able to use the 386 board, or re-spinning the > 68000 board to support one of the later 68k versions that will run Linux? In > my mine it seems like we have at least a couple more "direct" options for > Linux before going to the highly integrated module. > > > > I'd like to see a HD6120 board. But I have more things I'd "like to see" > than time to make them happen. > > > > Andrew > > On Tuesday, July 29, 2014 10:58:58 AM UTC-7, monahanz wrote: > > I have been doing some long term planning as to the direction I would take in > doing new S100 boards. To recap, we now have a 6502, Z80, 8080 (Josh), > 68000, 8088, 8086, 80286 and soon an 80386 set of boards on the S1000 bus. > Andrew and I have already started laying out an 80486 board. > > > > Since I do a lot of flying on business I have time to read up on chips and > recently I have been thinking what would be the best way to get ARM CPU's on > the bus. There are many types, and while one could start with a bare chip it > does seem to make more sense to start with an embedded module. There are > many of these, most of which boot up Linux immediately. One particular one > I'm fairly impressed with is an Italian one called "Aria G25" see:- > > > > <http://www.acmesystems.it/aria> http://www.acmesystems.it/aria > > > > Also it lends itself to easy pin splicing/layout on a board. It has good > documentation and software support. I particularly like the fact that it has > 60 GPIO pins. These could be easily spliced into our S100 bus so we could > use our current boards for I/O. (In fact at 400MHz, one could also use the > S100 RAM!). I know some of you will view this as sticking a Lamborghini > engine in a Volkswagen, but would it not be neat to see Linus running on the > S100 bus. > > > > Comments please, in particular I would be interested in any other similar > modules. > > > > 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]. > 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.
