Re: minimum VIC bad-line frequency??

From: Ruud Baltissen (
Date: 2001-05-04 11:15:14

Hallo Marko,

> 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)?

It just occured to me that, IIRC, when in 2 MHz mode the C128 goes back to 1
MHz when acessing the I/O-area. This would mean that all accesses by CPU
allways are in 1 MHz :(

If someone has a scope and C128 at hand, the only thing he has to do is to
put the C128 in 2 MHz mode, to pull DMA to GND and measure CLK2.

Groetjes, Ruud

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