8086 powered IBM PC compatible

"XT.8086" schreef in bericht news: snipped-for-privacy@db5g2000vbb.googlegroups.com...

I'm sure it can be done. Even I can do it. I'm as sure it will become too expensive.

The power supply will become too hot and too heavy. You may need a custom designed toroid or more then one standard type.

It's not clear what super I/O chip you're talking about but I suppose it will need at least a four layer PCB. Besides those chips are seldom available in low volume.

You will need a BIOS. There may be an existing one for free. Otherwise it may become more expensive then the hardware.

There are a lot of decisions to make before you can even start. About speed, video, types and numbers of I/O channels, type and number of expansion slots and so on.

So my guess - a wild guess I admit - is a pricetag of several thousend bucks for a working prototype.

petrus bitbyter

I'm guessing this is homework. The "to teach pure 16 bit design" is a bit of a give-away. Chances are, that is how the homework was sold to the students. The SRAM not DRAM requirement is because the prof doesn't want to grade DRAM designs -- pain in the ass. Super I/O is a all-in-one that includes the 8259 interrupt controller and some standard serial and parallel port items along with floppy control, that got included into the South Bridge when PCI came along. Again, it simplifies the student's work and the prof's review time. I don't the BIOS is required here. Just a presumption of one. It's school time, again.

Jon

I don't _think_ the BIOS is required here.

eed,

lots

ucks

wooowww your so smart. ok this is your assignment, design similar thing, powered by single AA battery.

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

ed,

ots

cks

I'm aiming at using 2 ampere toroidal transformer. It would be mostly using solid state harddisk so it will conserve power, and floppy drive is mounted only on the unit for teaching purpose . Do you really think it will exceed 2 ampere, give me your somewhat detailed estimate.

Video type would be 8-bit CGA or 8-bit VGA, we allready have plenty here and I want to reuse them (these one could suck up quiet alot of ampere I guess)

I want just one each for 16-bit and 8-bit expansion slot.

What kind of BIOS is free which enable us to use existing IBM PCDOS

What do you suggest if Super I/O chip is not easily obtained.

thanks. BTW I would like to know more of your company if you own one.

(...)

You got it in one try, Jon.

:)

--Winston

This would be a project that could fit into an FPGA. Current consumption would be small. IIRC I have a generic XT Bios source somewhere which can be assembled into a working BIOS using MASM. About

The HP200LX design may be of interest to you. It is a bit dated, but it was a IBM compatible PC (NEC V70) with a PCMCIA slot that was handheld and operated on 2 AA batteries.

TomC

Sure can. Do you have money?

Long while ago a friend of mine built PC XT 8086 on the breadboard from discrete parts. That board included I/O and CGA/HGS video. Worked fine.

For any practical purpose it would be easier to emulate PC XT on a modern computer.

Vladimir Vassilevsky DSP and Mixed Signal Design Consultant

I think someone did 30 years ago. Can't you find a copy of the IBM PC Tech Manual with full schematics? It must be on ebay occasionally.

There was even an issue of Popular Electronics in the mid 80's with a full schematic. It might have been called Computers and Electronics at the time, and it might have been spread over 2 or 3 issues.

My mind filled it in so I didn't even notice. :)

The IBM manual also had the full BIOS assembly listing.

Why?

The original PC and XT used 8088, which has an 8 bit data bus. For a turbo version, use NEC V20. It can also run 8080 code.

On Oct 3, 9:45=A0pm, snipped-for-privacy@puntnl.niks (Nico Coesel)

Why didn't I think about FPGA before, I must be getting older and dumber. Can you program FPGA in place of Super I/O chip.

I have 2 tube of 8086 I want to use them.

I am very interested to your BIOS, let me know in detail.

It would be nice to tinker with 8080 If I have some spare time.

They don't even know how to switch on the computer, much less starting an emulator.

The original 8080 is a PITA electronically - it needs 3 supply voltages with proper sequencing, and a weird clock.

For 8080 code in Intel hardware, think about 8085.

I don't see why not. I think most of the parts are available as VHDL or Verilog files.

I have a full set of unused, always stored in antistatic foam 8080 support chips plus the 8080 itself. I'll put them on ebay if you want