[Coco] about those memory capacitors...
theother_bob at yahoo.com
Sun Aug 15 14:35:08 EDT 2004
excellent, thanks James!
--- jdaggett at gate.net wrote:
> You should not experience any major problems leaving them out in
> 128K configuration. The RC network on the RAS/CAS lines are
> there more to reduce EMI radiation than anything else. For the
> 512K board the caps have to be removed as they present to much
> capacitance with board strays and input capacitance from 16 chips.
> If left in for the 512K board the memory may not work well in high
> speed mode.
> Leaving them out with the 128K configuration just shifts the cutoff
> frequyency upward of the pole that the RC network presents for EMI
> suppression. Basically if you can live with a bit more radiated
> harmonics off of the RAS and CAS lines, then leave them out.
> > I have two CoCo3's (in use) and one 512K memory upgrade. If I move the
> > 512K board to the other machine, what happens if the capacitors
> > removed (C65 and C66) are not replaced when going back to 128K? Would
> > it be okay to solder in 2 pin headers and attach the caps like
> > jumpers?
> > This is just until I can afford another upgrade or get my own working
> > right, but I would like to be able to use it in both computers. How
> > reliable are the sockets under repeated use like this?
> > TIA,
> > Bob
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