11 Aug
2008
11 Aug
'08
5:36 a.m.
On 11/08/2008 09:56, Ethan Dicks wrote:
On Mon, Aug 11, 2008 at 08:29:28AM +0100, Pete
Turnbull wrote:
> 4004 8008
> __ __ __ __
> D0 | U | CMRAM0 (-9V) Vss | U | INT
> D1 | | CMRAM1 D0 | | READY
> D2 | | CMRAM2 D1 | | phi1
> D3 | | CMRAM3 D2 | | phi2
> (+5V) Vss | | Vdd (-10V) D3 | | SYNC
> phi1 | | CMROM D4 | | S0
> phi2 | | TEST D5 | | S1
> SYNC |_____| RESET D6 | | S2
> D7 |_____| Vcc (+5V)
>
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.
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.
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
I came across this while looking for something else:
http://tams-www.informatik.uni-hamburg.de/applets/hades/webdemos/80-mcs4/in…
Never tried it, but it might be a place to start.
--
Pete Peter Turnbull
Network Manager
University of York