brianm@sco.COM (Brian Moffet) (06/01/88)
For those who have responded, I think the problem is
my monitor. I found this by turning up the contrast to
a high level (which got rid of the problem) and then turning it
back down. The problem went away when I turned it back down.
On the point of the Denise Chip, what would upgrading this give me?
Is this the one that controls EXTRAHALFBRIGHT?
thanks
--
Brian Moffet brianm@sco.com {uunet,decvax!microsof}!sco!brianm
The opinions expressed are not quite clear and have no relation to my employer.
'Evil Geniuses for a Better Tommorrow!'vkr@osupyr.mast.ohio-state.edu (Vidhyanath K. Rao) (06/03/88)
I have a 500 + 1084. Every once in a while, the display seems to use the same data for two scan lines. A colon will look like a | with a small hole in the middle. This is too transient to figure out what is going on. But occurs at least once every time I turn the machine on.
lfk@amdahl.uts.amdahl.com (Lynn Kerby) (06/03/88)
In article <557@osupyr.mast.ohio-state.edu> vkr@osupyr.mast.ohio-state.edu (Vidhyanath K. Rao) writes: >I have a 500 + 1084. Every once in a while, the display seems to use the >same data for two scan lines. A colon will look like a | with a small >hole in the middle. This is too transient to figure out what is going on. >But occurs at least once every time I turn the machine on. I seem to have just the opposite problem with my 500+1084, and I am pretty sure it is the monitor's fault. After I have had my monitor on for about 15 minutes, one set of scanlines drops out for about 15 minutes. I leave the 500 on all the time, so the only thing that has to deal with warm-up is the 1084. I always run interlace on the WB screen, and this is a real pain in the *ss (I get half of the display data and all the flicker - making it just about unusable until it warms up). Anyone else out there seen something similar with 1084's? -- Lynn Kerby - Amdahl Corporation Sunnyvale, CA ...inhp4!amdahl!lfk Disclaimer: Any and all opinions expressed herein are my own and do not necessarily represent the views of anyone, especially my employer.
grr@cbmvax.UUCP (George Robbins) (06/03/88)
In article <597@viscous> brianm@sco.COM (Brian Moffet) writes: > > For those who have responded, I think the problem is > my monitor. I found this by turning up the contrast to > a high level (which got rid of the problem) and then turning it > back down. The problem went away when I turned it back down. Hmmmm, wouldn't have guessed it from your problem description but I guess I should be happy it isn't an Amiga problem... 8-) > On the point of the Denise Chip, what would upgrading this give me? > Is this the one that controls EXTRAHALFBRIGHT? Yep. Halfbrite is a mode in Denise that says to take the data from the sixth bit plane and use it to control whether or not the outputs from the color table are shifted to the left by one bit position. None of the other chips have a clue that this is happening. Agnus is involved only to the extent that it's been told to fetch 6 bit planes, but that could be either EHB or HAM... -- George Robbins - now working for, uucp: {uunet|ihnp4|rutgers}!cbmvax!grr but no way officially representing arpa: cbmvax!grr@uunet.uu.net Commodore, Engineering Department fone: 215-431-9255 (only by moonlite)
tsukada@math.rutgers.edu (is here.) (06/04/88)
(1) In article <590@viscous> brianm@sco.COM (Brian Moffet) writes: > I have an Amiga 1000 which I bought way back in 1986 (Jan). > It has 512K RAM, 2 floppies, and a SNOY KV-1311CR > TV/Monitor. Every now and then, I notice that the interlace > is not handled very well. The odd lines look fine, but it seems > the interlaced even lines are half-3/4 intensity. Perhaps this > is my way of getting EXTRA_HALFBRIGHT ? :-) > > If I turn off the computer and wait a while, then things seem > to go back to normal. Has anyone seen this before? Any ideas on > what might be causing it? (2) In article <3892@cbmvax.UUCP> grr@cbmvax.UUCP (George Robbins) writes: > Sounds like some bizarre problem with the Denise chip... (3) In article <557@osupyr.mast.ohio-state.edu> vkr@osupyr.mast.ohio-state.edu (Vidhyanath K. Rao) writes: > I have a 500 + 1084. Every once in a while, the display seems to use the > same data for two scan lines. A colon will look like a | with a small > hole in the middle. This is too transient to figure out what is going on. > But occurs at least once every time I turn the machine on. (4) In article <34140@amdahl.uts.amdahl.com> lfk@amdahl.uts.amdahl.com (Lynn Kerby) writes: > I seem to have just the opposite problem with my 500+1084, and I am > pretty sure it is the monitor's fault. After I have had my monitor > on for about 15 minutes, one set of scanlines drops out for about > 15 minutes. I leave the 500 on all the time, so the only thing that > has to deal with warm-up is the 1084. I always run interlace on the > WB screen, and this is a real pain in the *ss (I get half of the display > data and all the flicker - making it just about unusable until it > warms up). > > Anyone else out there seen something similar with 1084's? I have a lemon500 + 1084. (However, I started to like my 500.) 1084 always make strange noises, and it also has the problem (4). Sometimes the lower half is perfectly Ok, and only the upper half has the problem of dropping one set of scanlines. Is it really the problem of 1084 ? or the Denise chip ? Has anybody had this problem fixed by sending 500 or 1084 to a repair shop ? H.Tsukada Dept.Math. Rurtgers U.