Re: [cc65] Machines with switchable clock

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From: Tim Schürmann (tischuer_at_web.de)
Date: 2003-02-20 14:48:17 

Hi!

Marko Mäkelä schrieb:

> On Sat, Feb 15, 2003 at 11:06:03PM +0100, Groepaz wrote:
> > On Saturday 15 February 2003 20:39, Ullrich von Bassewitz wrote:
> > > Just out of curiosity: Apart from the C128 (and C64 mode on a C128), are
> > > there other 6502 machines that have a user switchable CPU clock?
> >
> > uhmz... didnt the plus4 have some sort of 2mhz mode? *scratcheshead*
>
> Yes, or 1.6 MHz mode to be exact.  The CPU is automatically slowed down
> during video access, so you can't get the same sort of garbled screen as
> with the C128.

The Sinclair ZX80 and ZX81 (with a Z80 CPU) are working similar: with video
turned off, the cpu runs faster (because the CPU has to do all the graphics).
So, the ZX80 has two modes: fast and slow.

Bye,

Tim

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