[rescue] several second lag...
rescue at sunhelp.org
Sun Aug 5 01:41:32 CDT 2001
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.
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
> > 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
> rescue maillist - rescue at sunhelp.org
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