Graphics corruption

[yssing]

Ive seen something similar to that on my old A4K wit CYB64/3D it turned out to be a short circuit problem with two of the pins on the virge chip. After I fixed it no more graphics problem.

So maybe look for a short circuit on your board.

[delshay]

Another possibility is when some part of the SGRAM goes short circuit,when the fault is cleared it leaves permanent damage on the permedia 2, SGRAM may still be fine.

Permedia 2 needs at lease 2Mb SGRAM (2 chips) and must be allocated at bank 0 first to show any kind of display which is the side facing towards motherboard when installed, there you will also find bank 1.

This is why when modifying a A1200 with Blizzard/Bvision combo short circuit must not appear at bank 0 & 1 ( nearest to motherboard ) when installing  a Bvision which can give the result in this thread.

If using FastATA mk3/4 care must be taken that SGRAM bank 2 & 3 ( card facing upwards normal installation ) on Bvision does not come into contact with FastATA card which can also give the same result.

[rvo_nl]

thanks both, for your help. there is only one way to test this, with another ppc and/or a1200 mainboard. I will try to find someone in my neighbourhood to help me out.

This night I tried some old 32MB Simm and also swapped Bvision, video cable and connector PCB around, all without result.

I had a very close look at the ppc board, it really looks fine, also under the heatsink I dont see any damage.

[yssing]

I really hope that you find the problem.

[560SL]

Hmm... interesting. I have exactly the same problem with my Voodoo- card. The vertical lines are spot on....

Began a while ago when I started to fiddle with the hardware. After adding Indivision MK-II, ZoRam and a FastATA board. Also made some attempt to replace the Voodoo card with a Radeon, but that never worked out so I replaced the voodoo card again. It all happened with some holiday in between so I cant exactly remember when they started to appear.

What Ive seen is that they dont always appear, and when they do, it seems to affect bright colours less. Hi-, or low res don't seem to matter, they turn up on both maxed out WB- screens as well as low res Quake screens. Very strange.

[danbeaver]

Still sounds like a hardware problem

[freqmax]

@560SL, Perhaps ESD damage?

[campbell]

when you only power the motherboard via the floppy connector? Well.. its hard to know for sure since my cabling is so messy/broken, but I think my sound output isnt working. Could this be an indication?

  ____________________
Levitra

[delshay]

I need permedia 2 driver edited again,I need to test some new timing parameters for sgram.

[bitcpy]

Take out your Indivision AGA card. They are notorious for causing artifacts when they heat up.
 
Or it could be it has come lose from Denise.

[rvo_nl]

tried that, didnt help.
 
HOWEVER..
 
take a look at this wonderful, glitch-free screen:
 

 
this is with another a1200 mainboard. When I put my own board in, and go to CGXmode, I get instant artifacts. So, case closed. I need a new motherboard!
 
no wait, I should have tested  a bit more. Now I have the exact same problem again, with a different motherboard. It happens less, but for example when I move the window in the picture above, the lines come back again. So, must be the PPC then. I guess that means its the end, coz Im sure as hell not replacing that one.

[rvo_nl]

so, every screen after the first 1024x768/15bit screen has artifacts. its not related to the bvision. its not related to the memory on the ppc. its not related to the motherboard. its not related to software. its not related to any other on-board component. how can it be anything else than the ppc board itself? and if thats the case, which specific component is probably at fault here? Stachu? Delshay? ..is this something that is cured with a new 300mhz 603?

[delshay]

If you are using the same Blizzard card you could try a flash update.

Also if you want to sell your faulty card(s) contact me via PM.

[rvo_nl]

thanks.. I guess

Ofcourse I have the latest flash.

[Karlos]

thanks.. I guess

Ofcourse I have the latest flash.

If your card really is damaged, it's possible it can be repaired. There used to be an amiga repair centre (based in France, I think), though I don't know if it is still going.

Failing that, you have a few "BlizzardWizards" here, such as Statchu or Delshay, though whether or not they would want to repair it or just buy it from you in order to refurbish it and sell it on, I couldn't say.

[delshay]

I also have the latest flash,but every now and then I have to reflash it again due to changes.