4004/8008 (was Re: Forgotten PC History)

[Ethan Dicks]

On Mon, Aug 11, 2008 at 01:36:45PM +0100, Pete Turnbull wrote:
> On 11/08/2008 09:56, Ethan Dicks wrote:
> >I don't happen to have the 4004 datasheet handy (and can't get to it
> >for a number of hours), but the -10V Vdd requirement makes me wonder
> >if it's possible/feasible to use a pair of ganged ICL7660s (still made
> >by Dallas/Maxim) to generate it.
> 
> It takes about 30mA to run a 4004.

OK.  That might be a bit much for a pair of ICL7660s.  If not, it's
right on the edge.
 
> >I don't see a GND pin on the 4004, so I'm at a loss to estimate
> >what it would require for Vdd.  Anyone know or can check easily?
> 
> Some data sheets list Vdd = -15V and Vss = 0V, so the -10/+5 is just a 
> convenience.  Logic levels are relative to Vss.

Ah.  OK.  I've worked with DEC R-series logic (+10V/-15V power, +3V/GND
signals), so I didn't assume anything about the logic levels.
 
> >Also, does anyone know about any sort of 4004 emulator or simulator?
> >I wouldn't mind trying my hand at some code *before* trying to build
> >out the hardware.
> 
> The whole manual is available at 
> http://www.intel.com/museum/archives/4004ip.htm

Nice.  Thanks.  I'll grab that when the sats rise.
 
> I came across this while looking for something else: 
> http://tams-www.informatik.uni-hamburg.de/applets/hades/webdemos/80-mcs4/intro/mcs4.html
> 
> Never tried it, but it might be a place to start.

Yes... I'll check that out, too.

Thanks,

-ethan

-- 
Ethan Dicks, A-333-S     Current South Pole Weather at 11-Aug-2008 at 19:40 Z
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Ethan.Dicks at usap.gov            http://penguincentral.com/penguincentral.html