> Hm, I own a 6569R3, some 6569R5 and some 8565R2. I don't notice any > difference in picture quality between the 6569-Revisions, the > 8565R2 seems to provide a slighty brighter picture. It also has the > 'grey-dots-bug'. If you write to the background or border color > register (even if this doesn't change the contents) you get a grey > dot on the screen at the moment the register is written to. The > intro for Giana Sisters does show that quite nicely. Looks like a > kind of 'snow effect' if done right. This doesn't happen on a 6569. > On some 8565-VICs it goes away once the chip warms up. > > The bug is also present with TED and the VIC used in the C128. It > seems as if it got introduced with the switch to HMOS. Are you sure this depends on the chip, and not on the board? The grey dots are caused because #CS is active before the data lines are. The dots go away if you add a cap to the #CS line. Segher Message was sent through the cbm-hackers mailing listReceived on 2011-08-25 17:00:42
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