"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.
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.
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
3.0
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.
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
15 years ago I used a modified XT as a simple means to control home brew circuits.
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Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
nico@nctdevpuntnl (punt=.)
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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.
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.
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I don't see why not. I think most of the parts are available as VHDL or Verilog files.
--
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
nico@nctdevpuntnl (punt=.)
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