Re: Clock Stretching...

From: Marko Mäkelä (
Date: 2004-02-06 13:56:17

On Fri, Feb 06, 2004 at 05:34:52AM -0600, David Wood wrote:
> The only real reason to use clock stretching is because the cpu doesn't
> support wait states.  Most modern cpu's (even the z80) support wait states
> so that a slow IO device can hold the cpu captive while the requested data
> is presented.

Hmm, what is the RDY input then?  Couldn't it be used for implementing wait
states?  If yes, why didn't Commodore use it for anything else than blocking
the processor during DMA?  On the C64 and C128, the RDY input can be affected
by altering the -DMA input of the cartridge port.


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