Re: minimum VIC bad-line frequency??

From: Marko Mäkelä (
Date: 2001-05-04 08:55:43

On Thu, 3 May 2001, Ojala Pasi 'Albert' wrote:

Pasi> Did you forget the memory refreshes?:-)

Christopher> Yes :-)

Pasi> Yes, well, doesn't matter, refreshes are done with transparent
Pasi> accesses, no BA needed. I even confused myself for a while :-)

They do matter on the C128, however.  Ruud's question regarding the C128
cartridge port in 2 MHz mode is still unanswered, by the way.  Could
someone verify if the cartridge port bus is available all the time in the
2 MHz mode (minus the 5 RAM refresh cycles per raster line)?

As far as I remember, the REU always transfers at 1 MHz (minus the cycles
during which BA is inactive).  Having no special control bit, it wouldn't
know when the computer is in 2 MHz mode.


This message was sent through the cbm-hackers mailing list.
To unsubscribe: echo unsubscribe | mail

Archive generated by hypermail 2.1.1.