[Coco] about those memory capacitors...

[Robert Emery]

excellent, thanks James!

--- jdaggett at gate.net wrote:


> Bob

> 

> 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. 

> 

> 

> james

> 

> > 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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