Re: MOS 8565 VIC-II

From: Marko Mäkelä (
Date: 2003-04-30 14:06:03

On Wed, Apr 30, 2003 at 11:48:47AM +0200, Laze Ristoski wrote:
> Exactly, but not on the border this time. In case you write to $d022, dots
> will only appear in ECM mode on a char that uses $d022 background.

You got it.  The dots appear when the rest of the video chip tries to read
from a register that is being written.

It just occurred to me that even some VIC-20 video chips produce these
sparkles.  Pasi Ojala has such a VIC-20.  Also, on some VIC-20s, the colour
index 1 is completely white, while in others (including mine), it is more
like light gray.

> ps. Just noticed that two of my C64Cs are having
> power-up problems. When I swtich the C64 on,
> sometimes the screen is not black, but having chars
> like when you reset it. After this the C64 works normally.
> Any idea what would be the problem?

Have you tried different power supplies?  Or could the delay circuit for
the RESET line be failing?  That would be the 556 chip in earlier board
revisions; I don't know about the BN/E board or its immediate predecessor.


       Message was sent through the cbm-hackers mailing list

Archive generated by hypermail pre-2.1.8.