[rescue] several second lag...

[Mike Free]

I still have a running 128D too, well.. almost, as the keyboard or
controller has lost a line somewhere (every other key). I have a C128
programming secrets book, and according to it the fast mode is an artifact
of having to dual-clock the machine for CP/M mode, as the 8502 and the Z80
shared a mu-split CPU clock timing signal, which made both of the processors
run effectively at 1Mhz.

feature<=>bug  :)

Mike Free
the 80 column controller worked at 2MHZ though, but you have to program it
to function at all....
----- Original Message -----
From: "David Passmore" <dpassmor at sneakers.org>
To: <rescue at sunhelp.org>
Sent: Sunday, August 05, 2001 2:31 AM
Subject: Re: [rescue] several second lag...


> On Sun, Aug 05, 2001 at 01:53:33AM -0400, Mike Free wrote:
> > I'm really dredging the old memory to bring this up, but don't the
original
> > commodore systems run at 600Khz?
>
> They're usually listed at 1mhz, though they ran at something like .9mhz,
> using a 6516 (65C16 is the 16-bit version). The Commodore 128 had an 8502
> that could run in 'fast mode' at 2mhz (1.8mhz) but you had to shutdown the
> 40-column display controller.
>
> David, who still has a running 128
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