Re: Apple IIc+ @8Mhz

[Hotte <spam@die-kempers.de>]

> We had a lot of discussion on this at KFest and came away with the following:
>
> 10MHz is possible under ideal situations, 8MHz is usually the easiest to
> achieve without replacing cache and other mods. And, some //c Plus computers
> won't stabilize over 4MHz no matter what oscillator or cache mods are
> attempted. So, OC'ing can be hit or miss... some study is required to determine
> why some machines won't chip up, even with cache upgrades.
>
> It's safe to say the stock cache isn't supposed to be fast enough for 10MHz.
>
> James Littlejohn and Henry Courbis (gse-reactive.com> are in the process of
> finalizing a convenient 8MHz upgrade for the //c Plus - as mentioned in this
> post,http://www.a2central.com/portal/?p=1366
>
> Sorry, didn't mean that to be a blatant plug, but they are working on a way to
> make the "Little Speedup" very OC friendly.


Thanks for the update, I have not read the K-Fest article.
But this is a diffrent approach I think. A Switch board between 4Mhz
and 8Mhz has been done before and it is just a Switch between two
Oscillators.
It is new for me that some IIC+ would not go higher than 4Mhz, maybe
early models with borderline CPU's?

I went straight for a CPU replacement therfore I did not face such
problems.

So what is speeding up just a question of faster RAM and CPU? What
would be the "other Mods" ?

I am looking forward to see the "Little Speedup" Board because I
wonder how they manage the problem not to unsolder the Oscillator.
I had to do this and replaced it with a little DIL socket so that I
just have to plug in the diffrent Oscillators. (Also something which
was done before)