--- Ruud Baltissen <Ruud.Baltissen@abp.nl> wrote: > Hallo Marko, > > > Has anyone made any experiments with overclocking NMOS chips? > > No, but with underclocking. The 6502 runs at 500 KHz but dies at 250 KHz. > What is the explanation? Internal capacitors probably discharging before the next clock cycle hits, like if you miss a refresh cycle on a DRAM. Not all processor designs are stable at near-DC clock-rates. The 1802 is. A friend of mine was debugging his Elf with a debounced switch and a volt meter because he didn't have an oscilloscope when he was 16. It works. Several seconds per clock tick, 8 ticks per cycle, 2 or 3 cycles per instruction. Could be some sort of R-C driving a flip-flop as part of the state machine for the processor states or something similar. I doubt the registers are dyanamic, but they could be - it would reduce the part count. Anyone have any internals knowledge? -ethan ===== Visit "The Seventh Continent" http://penguincentral.com/penguincentral.html __________________________________________________ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/ Message was sent through the cbm-hackers mailing list
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