Re: CIA old/new?

From: Uffe .. Jakobsen <microtop_at_starion.dk>
Date: Thu, 7 Jan 2021 16:40:12 -0600 (CST)
Message-ID: <1610059212741-0.post_at_n4.nabble.com>
Segher Boessenkool wrote
> My position is it is not a bug at all, it is as designed.  And it
> wouldn't even be noticed until very many years later :-)

Well not that many years later...

I was quite surprised when I at some point in 1988 ran one of my own demos
on a C64C with HMOS-II VIC-II.
I my own was a breadbox C64 with NMOS VIC-II and everyone I know had those.

So the surprise was quite big when I got access to a C64C/HMOS based system
and saw grey dots every where on my demo.
Looking at the demo made it quite clear what the problem was...
Do not change the border or background color while the beam is visible on
the screen....
But that is quite difficult to avoid when doing vertical raster splits :-D

/Uffe




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Received on 2021-01-08 00:00:02

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