8086 powered IBM PC compatible

Why re-invent the wheel or re-design something available? Those old boards (and compatibles) from the original PC/XT are still around. Find a bunch and offer to buy them from the scrap pile..

Oh...you are talking about a price close to the original cost of a

..which is a sign of a wandering mind or a clue as to how little the OP knows..

..using 100 percent CMOS (400 series) logic.

berichtnews: snipped-for-privacy@db5g2000vbb.googlegroups.com...

I hink the original IBM PC/XT drew about 65W.

I know nuthin about 8080. Tell me what have you done to those 8080 :-)

ll

where is it. anywhere nearby here is at least Pentium 500 Mhz board.

...

too

stom

it

e it

speed,

n slots

d bucks

should it be 4000 series, sorry for being picky :-)

It will keep my coffe warm

Free Geeks in Portland may have some. Might try calling them. Such machines won't be listed on the web site, though. And they may not exist there. So I don't know. Just a shot.

I have operational here 80386 running at 33MHz that provides ISA 16 and 8 bit slots, which I use. Won't sell. I also have 80486DX system -- same story, I keep it. Also, Pentium running at 66MHz. I keep that one, too. All good. I like having ISA around, as I design and build my own ISA boards. No way do I want to do that with PCI or later. (I have two editions of Solari's book on the ISA bus that I use as a reference, plus

You might consider PC/104 boards. Although you are probably going to be stuck with PCI support, some of the boards still support the old ISA bus. Connectors won't be of the same form factor -- they are PC-104, not ISA -- but the bus transactions may be just fine. Need to read data sheets to be sure. However, it's likely to work. For example:

Supports DOS.

I happen to have some older PC-104 stacks here and they work fine with DOS, Win98SE, etc. I can run old applications I wrote back in the good old DOS days, just fine, on them.

But the following suggests to be that 8-bit and 16-bit transactions are still supported, despite the deprecation of the old ISA bus:

As you can see, prototype boards using the PC/104 connector are still available.

These also provide support for my suggestion that they still support the old ISA bus:

As they provide a board for tying in PC/104 boards into a PC with genuine ISA slots in them -- for test and development.

Also, here is a short spec:

You could reasonably build up a PC from these, a power supply you provide (or buy, because they sell them too), and a case (which you can also buy, but it won't likely have room for the old ISA slot connectors... so you may need to do a little packaging on your own.)

Those processors they sell now will do 16-bit stuff. They will do 32-bit stuff, too, I think. And 8-bit. And I think, regardless, they will work with old software you might have in mind. Won't solve your "run on AA battery" query, won't provide a teaching platform for 16-bit design, and won't solve whatever it is you are really about here because I still don't believe you've been frank and honest yet in the group about that.

But if you are truly interested in buying an old computer, then you could credibly fashion such a thing from modern parts being sold today. If my 80386, 80486DX, and 6 slot ISA based Pentium boards were to fail, I'd probably pick up one of these and fabricate the ISA connector slots I want and select an appropriate PC/104 system to drive all of that and let that replace stuff.

I also have perhaps a dozen, still shrink-wrapped, DOS 5.0 retail packages from Microsoft sitting on the shelf. I happen to still like DOS development for boards I build here and keep a Micosoft vc++ 1.52c compiler (legal) for that purpose (in fact, Microsoft still provides it for MSDN licensees for download -- which I also happen to be.) I also use x86 assembler, as needed, and have a 32-bit protected mode O/S I've developed for play purposes.

But I don't think I really know what you are about, yet. From the sound of things so far, and temporarily granting you have some still-unstated reasonable purpose in mind, your best bet might be to call up one or more of the PC/104 manufacturers and ask them to help you out. Chances are one of them will pass you over to a designer you can talk with and ask questions regarding what is available for your purposes, whatever they are. Those folks are in the middle of it and are your better bet for the most up-to-date data. Make the phone calls and ask for help. They may even have a design you can have for free. Could happen. Get that research done and get back to us about your results. Here's a short list of folks to call:

Jon

Sorry, should be:

(I have two editions of Solari's book on the ISA bus that I use as a reference, plus _Mindshare books, as well_.)

Original XT motherboards aren't hard to find.

Open Cores has an 8080 and an 80186 core.

XT.8086 expounded in news: snipped-for-privacy@d26g2000vby.googlegr oups.com:

Run it all on top of something modern, but using Virtual Box.

Now if only Plan-9 and Mac OSX ran on it-- maybe it's time I tried it again. I see they're up to version 4.1.4..

Warren

One issue with the V20 is that it like an 8088 had a 8 bit data bus, for the 16 bit data bus use a V30.

?-)

I don't think so. There were 8086 based clones out there. You would = need

?-)

Tern has a variety of x86 stuff.

Cheers

The ISA bus has to support for 8 bit operation. All 8 bit onboard peripherals should be accessible from 16 bit CPU bus in correct way. The 8 bit only PC system is much simpler then 8/16 bit as you don't have to split or merge cycles.

Vladimir Vassilevsky DSP and Mixed Signal Design Consultant