Re: partial CIA #2 failure?

From: Ethan Dicks (
Date: 2006-09-05 05:16:20

On 9/4/06, Pasi Ojala <> wrote:
> That reminds me of my Amiga 8520-CIA failure. Only the event counter
> was broken. The event counter counts scanlines and is used by
> the Workbench to "hide" screen updates. When the counter is broken
> and you double-click, the workbench usually gets stuck.

Hmm... didn't know Workbench used that timer.

> There was a patch available that disabled this feature. Then you
> could use the 6526-CIA also, because the only difference is the
> TOD clock (BCD counter) vs. event counter (24-bit counter).

I wish I'd known about that patch years ago - I had at a least one
A500 with a busted CIA that I would have been happy to have swapped
with a 6526 (I did know the timers were different).


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