Path: utzoo!attcan!uunet!lll-winken!lll-lcc!lll-tis!helios.ee.lbl.gov!nosc!ucsd!ames!amdahl!lfk
From: lfk@amdahl.uts.amdahl.com (Lynn Kerby)
Newsgroups: comp.sys.amiga
Subject: CBM 1084 monitor problems (was SONY monitor giving problems)
Keywords: 1084 interlace garbage
Message-ID: <94J9R3caSH1010uGymc@amdahl.uts.amdahl.com>
Date: 5 Jul 88 22:55:17 GMT
Organization: Amdahl Corporation, Sunnyvale, CA
Lines: 65

[To refresh some memories, here is a summary of what has been posted on
 the subject of monitor problems ]

In Article 21455 of comp.sys.amiga:
>(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.

Now to add to it once again.  I just purchased a 2000 and the same thing
happens as I posted above (number 4).  If this is a strange problem with 
the Denise chip (as suggested by grr above), it must be a very common 
problem!  Is someone from CBM looking into the problem as a 1084 problem?
Sounds (and looks) to me like the problem is that the 1084 is a lemon.

-- 
     Lynn Kerby  -  Amdahl Corporation
                    Sunnyvale, CA
                    ...amdahl!lfk
		    lfk@uts.amdahl.com

Disclaimer: Any and all opinions expressed herein are my own and do not
            necessarily represent the views of anyone, especially my
            employer.