Re: 264 series questions

From: Levente Hársfalvi (
Date: 1999-10-04 20:54:16

Hi Marko!

> One interesting thing, found by Levente (I think), is that memory
> refreshes are like reads from $FF00-$FFFF.  When the refresh was at
> $FF00-$FF3F, the program recorded the corresponding TED register values
> (although it was reading from the same constant address in open address
> space all the time).

Ugh... Sure I did prove this refresh thing someway. But I don't remember

> Yes, and the CPU will automatically be switched to single clock when the
> TED needs the bus.  I'm not aware of any way to override that, to get a
> result similar to that on the C128, where the VIC-IIe will happily display
> data fetched by the processor.

The same goes for the Plus/4. Just remove the vertical border with the
same trick you'd use on C64; if you switch the computer to single clock
mode, you can set the pattern the same way as in C64. But when enable
twiee clock, the borders will display the data fetched by the proc.


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