From: Michael Huth (520052975648-0001_at_t-online.de)
Date: 2003-04-29 13:28:00
At 09:11 29.04.2003 +0200, you wrote: >Seems this is the best place to discuss about hardware. >I have noticed some sort of vertical lines on my >new VIC. Well, if I check my old VIC, it also >produces some lines, but they are almost unnoticable. >I wonder what produces these? I have also noticed AFAIK there are two major Versions of the VIC-II. The old one has no vertical lines at all. It has a quite unreadable red color on blue background. It also produces no light-grey pixel if you change a register. I checked several old ones and noticed that the red-color varies a lot, there are some old ones with a 'better' red that's even readable on blue background. The newer Version has the vertical lines (i.e. brightness differences). According to their periodicity, I guess it has something to do with the phi/2-clock. Maybe some interaction within parts of the chip, since it manages the clock itself?!? (C= had such problems already before, f.e. with 6522 or VDC) The grey dot's always appear on a new VIC if you access a VIC-register. It even works if you write f.e. to a register that does not change anything on the screen, you'll get grey-dot-snow. I do not know why this occurs, but I think it may be some internal problem with the pixel-clock-shifter delivering a wrong color signal?!? Ciao.... ...Micha Message was sent through the cbm-hackers mailing list
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