Re: Dating a C-64 board

From: Nicolas Welte (
Date: 1999-04-18 20:05:58

Richard Atkinson wrote:
> > > I think Andreas Boose wanted to know once if the reset bit, that is
> > > disabled in all known VIC-II chips is perhaps active in very early
> > > versions. Perhaps you could try it on your machine?
> >
> > Sure... give me some more details.  I can write a quick BASIC program if
> > I know what addresses you want wacked.  How does it behave in later C-64's?
> I think VIC-II just ignores it - I need to know this for the project. I
> wonder if I can reclaim it as a mode bit as I am doing with bit 7 and bit
> 6 of that register.

Let's finally name the register: It's register D016, bit 5. I think
setting this bit from BASIC and, after waiting for one frame or longer,
clearing it again, should quickly reveal if it is active or not. There
really should be some visible indication of its function.


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