Date   : Tue, 13 Apr 2004 17:34:11
From   : D.G.van der Pol <danielg@...>
Subject: Re: OVERCLOCKING

Op 12-apr-04 om 21:07 heeft Dr. David Alan Gilbert het volgende
geschreven:

> * JAMES WATSON (james@...) wrote:
>> Is it possible to overclock a bbc micro, how would you go about doing
>> this?
>
> I seem to remember Solidisk once had a board that did that; running
> stuff twice as fast; I don't know how it did it, but a friend who
> had one told me he had to replace most of the decoupling caps to get
> it to work reliably.
>
Oh yes, they were called the Solidisk 4Meg boards, I have one with 256k
sideways ram on it. It is very unreliable in 4 MHz mode, so I only use
it as a shadow/sideways ram board. It would report the speed as
selected by an external switch in 2Mhz or 4Mhz at startup.
I have made numerous calls & written many letters to Solidisk but they
never came up with a reasonable solution.  I might give it another try
by replacing those decoupling caps with better ones. That is a very
good tip.
Even though my 'overclocked' BBC has hardly worked properly, there was
hardly any use for it as all I did was play games.
It seems easier today to use a very fast PC to emulate a BBC beyond its
speed limits.
Good luck,

DG