[ Date Index ] [ Thread Index ] [ <= Previous by date / thread ] [ Next by date / thread => ]
On Saturday 17 November 2007 09:41:07 Tom Potts wrote: > http://www.theregister.co.uk/2007/11/16/intel_4004_calc_simulator/ > the first comment is rather amusing! > Tom te tom te tom I had a 4004 system once. It was a salvaged Central Dynamics video edit controller from 1974. Full of relays and lots of TTL. The display was nixie tubes, with the colons between the digits - early LEDs. It had the most amazing way of executing user options. Each user "program" had its own EPROM. The keyboard had a set of function keys. If you pressed a key it would select an EPROM (latched in TTL) and reset the processor. So every function hard reset the CPU, which just ran the new EPROM from the start. Weirdest architecture I've seen. For a small package it needed half of its pins to provide multiple power rails, and multiphase clocks, if I remember correctly. I wonder what happened to mine? D -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html