On 8/24/2011 12:05 PM, Gerrit Heitsch wrote: > On 08/20/2011 06:21 PM, Bil Herd wrote: > > >> So there was ONE RULE when I got the Ted project, it has to have xxx >> number >> of chips (I think it was nine chip) and no more, signed Jack Tramiel. >> Well >> the TED’s reset circuit consisted of an RC circuit and a 7407. I >> proved it >> wouldn’t work but I didn’t think about what this really meant as >> to who had >> designed the computer (the answer was no-one had designed the >> computer at >> that point) It was an easy argument to make that the computer would >> fail en >> masse, we HAD to add a chip for reset, didn’t matter which chip, we >> simply >> could not do it with a transistor or a 7407 gate. (yes I tried >> feedback to >> create hysteresis ) The answer came back from the mountain that >> it was >> okay to add a chip. I remember that people were stunned that I had >> challenged this (some thought I would be fired) and won. > > That was the famous 555 timer chip if I read the circuit diagram > right. Same way as the Reset was generated in the C64 on the older > revisions. > > Thanks to whoever added the reset button to the 264. It always irked > me that the C64 didn't have one. If everyone else knows, can someone relate just WHY the original 7407 and RC would not work? Jim Message was sent through the cbm-hackers mailing listReceived on 2011-08-25 00:00:03
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