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VLB ISA cards questions

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First post, by muon

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Hi!
I recently bought this VLB card.

IMG-20190414-094719.jpg
The seller said the board was OK. I plugged that VLB in my VLB system and It doesn't work properly. I changed the JP2 and JP3 jumpers (JP2 1-2 and JP3 2-3) and the board works properly now ( The original setting were JP2 2-3 and JP3 2-3).

IMG-20190414-094737.jpg

In the PCB board there are a chart with the meaning of the jumpers, but I don't understand it: I changed from "M IO" 44 (JP2 2-3 and JP3 2-3) to "M IO" 33 (JP2 1-2 and JP3 2-3)

IMG-20190414-094725.jpg

Has anybody got any idea about that?

Second VGABoard:

I thought that it's a cirrus logic chipset vga card, but I run a cirrus utility to identify the chipset and I got a message the board has not got a cirrus chipset . Any idea about the chip?

IMG-20190416-093200.jpg IMG-20190416-093205.jpg

thanks in advanced

Reply 1 of 6, by Deksor

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Can you describe "not working properly"

What's the rest of the computer ?

Trying to identify old hardware ? Visit The retro web - Project's thread The Retro Web project - a stason.org/TH99 alternative

Reply 2 of 6, by Cyrix200+

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Searching the FCC ID (J4UVGA826WVLC3) on Google returns a lot of pictures of this card, all with a Cirrus Logic GD5428 chip. This one from eBay also has the jumper settings documented:

https://i.ebayimg.com/images/g/59MAAOSwKSlcGI5x/s-l1600.jpg

I guess they add a WS when set to > 33MHz

1982 to 2001

Reply 3 of 6, by einr

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This is very similar to your ET4000 card, and looks like it has the same jumper settings:

http://arvutimuuseum.ee/th99/v/C-D/50758.htm

The number in the "M" column is the number of memory wait states, the number in the "IO" column is the number of I/O wait states.

The more wait states you have, the slower video speed is going to be. Your bus speed is too fast (or your motherboard is too crappy 😉) for the system to keep up. That's why it didn't work until you added wait states.

EDIT: oh, it looks like it worked after you REDUCED the number of wait states. That's weird and I don't have an explanation, but either way this is what the jumpers do.

Reply 5 of 6, by muon

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Cyrix200+ wrote:

Searching the FCC ID (J4UVGA826WVLC3) on Google returns a lot of pictures of this card, all with a Cirrus Logic GD5428 chip. This one from eBay also has the jumper settings documented:

https://i.ebayimg.com/images/g/59MAAOSwKSlcGI5x/s-l1600.jpg

I was betting on it: VGA BIOS with cirrus logo (see the picture), screen boots messages with cirrus message, but the identify utility from cirrus said it's no cirrus chip ¿¿??

Cyrix200+ wrote:

Searching the FCC ID (J4UVGA826WVLC3)I guess they add a WS when set to > 33MHz

It doesn't have much sense: the mothrboard speed is 33 MHZ. The motherboard has a 486dx4-100 (33x3)

Reply 6 of 6, by muon

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einr wrote:
This is very similar to your ET4000 card, and looks like it has the same jumper settings: […]
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This is very similar to your ET4000 card, and looks like it has the same jumper settings:

http://arvutimuuseum.ee/th99/v/C-D/50758.htm

The number in the "M" column is the number of memory wait states, the number in the "IO" column is the number of I/O wait states.

The more wait states you have, the slower video speed is going to be. Your bus speed is too fast (or your motherboard is too crappy 😉) for the system to keep up. That's why it didn't work until you added wait states.

Thanks for the info. I've seen the link and You are right: my vga looks like vga that you say

einr wrote:

EDIT: oh, it looks like it worked after you REDUCED the number of wait states. That's weird and I don't have an explanation, but either way this is what the jumpers do.

.

me neither understand

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