Graphics corruption

[delshay]

I am inclined to agree that it's a configuration (or power or both) issue simply because the chance that 3 successive bvision cards all suffer the same specific defect seems remote.

Make sure any overclocking tooltypes are disabled in the monitor driver (hint: 2AIDEMREPYMNONAFADELLATSNII, MELTDOWN)

If done correctly overclocking has nothing to do with this problem. I have finished the Ultra Bvision which is clocked 125Mhz and sets a new world record.

A Master Bvision is now also complete,but I am awaiting driver update for this card,but even without the driver update has set another world record with its Ultra Low Latency SGRAM (speed will never be revealed).

Both Bvision work on 37.5Mhz+ bus regardless if the PCI bus has jump ship.

[delshay]

It helps by showing that up to 125 MHz should work?

Pushing the D/A (or RAM) above certain bitrates can make them go gibberish.

All true,but I don't think it will work on any other Bvision as my permedia 2 chip is different and has 250Mhz Ramdac as standard with 143Mhz SGRAM chipsets and does not go gibberish.

There is also timing parameters to take advantage of faster SGRAM,but none of this is available/or will not work on any other Bvision card in its current state.

Anyway all this does not matter as Master Bvision is working,and now sets the pace and i think it may get quicker.

[delshay]

Check SGRAM on Bvision not coming into contact with something on motherboard.
Check Bvision(s) on another Blizzard card.
Check Blizzard card PCI connection for contact stray wire/poor solder contact.
Check thermal paste (if any) not in contact with soldering contacts.

[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.

[delshay]

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

[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.

[delshay]

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

[delshay]

You don't have to wrap anything in duct tape, normal installation is fine even with A1200 shieiding ( desktop A1200 only )

Bvision carries 12v but is not used, however 5v is present with-in the cable,but i would expect your problem to be a lot worse if 5v is sent back into the Permedia 2.

It is recommended that all users add the minimum heatsink to permedia 2 even if its not overclocked.

If using indivision care must be taken of cable routing as not to put to much stress on Bvision connector. Same applies when installing Bvision,do not over tighten screws.

As you don't know where the memory is STOP.  Get a expert to look at your system.

[delshay]

I hope you are right about the fault,but I find it very strange that you have tryed 3 different Bvision and all show the same fault.

If the fault reappears then you know its not the Bvision.

Check other Bvision(s) on another Blizzard card.

[delshay]

The Bvision to the left will not work, its missing some components. Nice to see correct size heatsink on one of the Bvision.

Bvision can perform, it needs the right modification(s) to perform with or without overclocking.

Users with Micron Sgram may have better overclocking with users with Fujitsu Sgram,this type of Sgram is fitted as standard on Bvision. Some users may have another type of Sgram fitted as standard.

There are other factors which also affect how far you can overclock,but overclocking Sgram does not get the best performance out of the Bvision,its the bus speed which gives the best performance which is working here upto 41.83Mhz and shows benchmarks I have never seen before.

Flashrom & Bvision driver may gain more performance.

[delshay]

If Bvision was working in the past,then stop working then you have to assume the problem may return as it seems you have done nothing other than just changed Bvision.

The PCB you insert maybe work itself a little loose and comes into contact with Bvision maybe when you move the unit or due to vibration.

If the PCB is very near to Bvision then I recommend a very thin piece of flexible plastic cut to size and glued to the underside of the PCB to cover all solder contact. Glue just the four corners of the PCB not all of the card.

HOT GLUE recommended,but I would get a expert to do this for you.

Before doing all above you need to be sure the PCB is not damaging your Bvision and given that it is now working going back and disturbing the card(s) may trigger of the fault again and may permanently damage the Bvision again.

If the fault returns you are going to think I should have looked into it further.

[delshay]

Bvision can be fast as the PC version if all the talk of DMA driver & 41.5Mhz bus. It will be good enough for standard browsing,but I have seen it do some awesome performance with 3D games with 1024x768 16bit on classic amiga and given from what I have seen voodoo cards are going to need better driver besides I like my wedge shape A1200.

Blizzard PowerPC 350Mhz.

[delshay]

I may have made a error,but did you not say you plug-in a PCB on to the connector for tower LED display, I must be wrong sorry for the confusion as I don't have time to read back though thread.

Disregard last few comments,enjoy.