Re: Z80 CPU Speeds? - Upgrading

[Eric Smith <eric-no-spam-for-me@brouhaha.com>]

"Brian A. Davis" <badavis@nbnet.nb.ca> writes:
> Sorry, Roy. I was not specific enough. I have a PCPI Appli-card with a 6 
> MHz Z80B. On board the Appli-card is a 12 MHz oscillator. This is what I 
> was thinking of changing. I did not mean the oscillator on the Apple IIe 
> motherboard.
> 
> The PCPI Appli-card has its own 64k RAM bank, so the only interactions 
> between the card and the Apple IIe motheboard are I/O calls (I think).

It *might* work.  But even if it seems to work, I wouldn't count on it
being reliable.  Running it faster than designed will probably result
in the memory timing being on (or over) the hairy edge.