4004/8008 (was Re: Forgotten PC History)

On Mon, Aug 11, 2008 at 08:29:28AM +0100, Pete Turnbull wrote: Hmm... I happen to have a couple of 4004 chips (one pulled from a non-UPC barcode scanner, the other from a commercial kitchen scale), and I've long fantasized about building some showcase 4004 circuit, probably a digital clock. 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. This chip came up recently as a possibility for generating -5V Vdd for 4116 DRAMs (and I think the concensus was that it would probably be adequate for up to 16 chips), so I do recall that it can only source a few mA (each 4116 needs a few dozen uA)... 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? 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. -ethan -- Ethan Dicks, A-333-S Current South Pole Weather at 11-Aug-2008 at 08:50 Z South Pole Station PSC 468 Box 400 Temp -68.4 F (-55.8 C) Windchill -111.4 F (-79.7 C) APO AP 96598 Wind 17.0 kts Grid 23 Barometer 671.5 mb (10950 ft) Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html