11 Aug
2008
11 Aug
'08
12:43 p.m.
On Mon, Aug 11, 2008 at 01:36:45PM +0100, Pete Turnbull wrote:
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.
Nice. Thanks. I'll grab that when the sats rise.
On 11/08/2008 09:56, Ethan Dicks wrote:
OK. That might be a bit much for a pair of ICL7660s. If not, it's
right on the edge.
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.
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
South Pole Station
PSC 468 Box 400 Temp -78.7 F (-61.5 C) Windchill -123.7 F (-86.5 C)
APO AP 96598 Wind 15.9 kts Grid 13 Barometer 671.6 mb (10947 ft)
Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html