Can someone tell me what the point is having 3.5 volt for the cpu socket.
I want to use a pentium 90 classic. If i use cpu-world as reference. Its telling me, that it need to have 3.3 volt for this processor..

It depends of the CPU revision as well. Here's the pentium 100 SX960 https://www.cpu-world.com/sspec/SX/SX960.html asking 3.45V

Now this wasn't super useful as most CPUs indeed work fine at 3.3V. The AMD K5 was one of the only CPUs designed for 3.5V iirc.

Deksor wrote on 2022-12-08, 23:23:

It depends of the CPU revision as well. Here's the pentium 100 SX960 https://www.cpu-world.com/sspec/SX/SX960.html asking 3.45V

Now this wasn't super useful as most CPUs indeed work fine at 3.3V. The AMD K5 was one of the only CPUs designed for 3.5V iirc.

I just want to take a moment to say thank you for taking the time to compile a proper usable manual for this. I saw the date on the OP and the date on the first reply and thought the forums glitched. There needs to be some acknowledgement when people go out of their way to do stuff like this... preferably not 3 years after the fact. 😀

Deksor wrote on 2022-12-08, 23:23:

It depends of the CPU revision as well. Here's the pentium 100 SX960 https://www.cpu-world.com/sspec/SX/SX960.html asking 3.45V

Now this wasn't super useful as most CPUs indeed work fine at 3.3V. The AMD K5 was one of the only CPUs designed for 3.5V iirc.

Strange thing to notice that the cpu volt goes up for a later one. I would have been expected that every new cpu due manufacturer procede would go down in cpu voltage as you see now day.

Is there anyone who can help me with an OEM Vobis (VBS) Highscreen) bios?

I powered up my board with 512KB installed. before it worked fine. Then starting up with the 512KB (knowing its not the culprit) Screen went on as normal, so cache should be no problem.

With the first boot already didnt saw the HIGHSCREEN screen (red letters and white / gray backgroud) as normal.. So i think the bios rom was already bit corrupted. Why this screen wasnt there.

At third boot i got a screen sync problem en screen went out.

After the next boot. Motherboard startup fine.. Then again not any signal anymore to my LCD screen.

Also tested some other PCI cards.. But board seems to be not giving any display anymore. Only hear the floppy drive is spinning up for check.

Here´s the original BIOS with HighScreen logo:

majestyk wrote on 2022-12-09, 09:06:

Here´s the original BIOS with HighScreen logo:
VBSPA2000.7z

Thank you very much.. Iam going to test it out..

I have put the Flash rom in my reader / writer and there are some not good behavior.. First check 3 faults, second check 6 fault.. So the memory of the flash was degrating.

Is it worth to go for the older DIP32 Flash chips ? or better for replacement go for 32 PLCC with converter to DIP32 instead.

I dont know how the longivity is of these older types over the newer package ones? Can image that these older DIP32 versions resides a very long in a warehouse will maybe fail in about 5 - 10 years from now.

majestyk wrote on 2022-12-09, 09:06:

Here´s the original BIOS with HighScreen logo:
VBSPA2000.7z

Is there anyone who can edit this bios for HDDs till about 32 GB support.?

Robin4 wrote on 2022-12-09, 01:27:

[...]

Strange thing to notice that the cpu volt goes up for a later one. I would have been expected that every new cpu due manufacturer procede would go down in cpu voltage as you see now day.

Not so strange: back then Intel's advantage in terms of fabrication processes was bigger than it is now. AMD was trying to beat Intel with the equivalent of a 2 or 3 year older process. That was also why the CPUs ran so hot.

Robin4 wrote on 2022-12-27, 23:56:

majestyk wrote on 2022-12-09, 09:06:

Here´s the original BIOS with HighScreen logo:
VBSPA2000.7z

Is there anyone who can edit this bios for HDDs till about 32 GB support.?

You can use ROM.by´s BIOS patcher (4.23) for that. It´s very easy to use.

Iam guessing that this patcher program doesnt work in 64 bit windows versions? So i need a older system for it?

Can `t find the system specs on that site.

I found out that the board have an option for Internal keyboard and External keyboard.

From my point of view of it should there be a keyboard controller inside of the bios chip?

There seems to be also an empty large socket on the left lower side of the board.. Iam guessing that seems to be for an Keyboard controller bios chip..

If iam right..

External keyboard should be external keyboard controller driven situation.. And Internal keyboard should be maybe the controller of the keyboard inside the bios chip?

You only have to switch a resistor array between the isa slots and add a second one.. And set Jumper JX1 to 2-3 instead of 1-2 (which is base setting)

Can somebody maybe tell me if iam right or wrong that the keyboard controller is inside the SST PH29eee10 flash chip.. If not. Where could it be located on the board.

Floppy drive as harddrive are stuck when trying to boot.. System is hanging then.

Also think the I/O contoller chip National Semiconductor could be bad as well.

Can't be a coincidence that both suddenly don't work.

The BIOS chip is not involved here.
Probably the super-I/O chip has a built in KB-controller, or it´s integrated in the VIA chipset (VT82C416). When there´s a different type of super-I/O on the board that does not have a built in KB-controller, or for other reasons, the 48-pin socket is used for a seperate ("externnal" to the super-I/O and chipset) keyboard controller.

Sorry for hijacking this topic. Its important to reply here, because of my older posts i have made earlier here.
I have 2 of these board laying right here in front of me.. Looking for a good working and would will fill my setup needs. (trying to build a Vobis Highscreen Pentium 133 / 166 computer)
As Intel cpus goes, the fastest would be a pentium 133 Mhz on it.
Is there any cpu list out there that can could tell me which other cpus would run fine on this board.

And is there a way to getting a Pentium Overdrive 166 MMX working on it. It seems the VBS 1.11 bios isnt compatible with an Pentium Overdrive upgrade.
Is there anyone with a higher knowledge that have the abillity to inject Pentium Overdrive (MMX) CPU ID code in to the current rom so an Pentium Overdrive also could run on this board.

The board is able to use 66 Mhz Bus and 1.5x or 2.0x multiplier.

Hi Robin,

A year ago I have been working with scorp (Necroware) to get a Pentium MMX or K6/233ANR working on his PA-2000.
We found that the Vobis VBS1.11PH BIOS didn’t have any AMD K5/K6 support and only worked with the Pentium P54. When using a Pentium MMX, the board did POST but hung just before starting the boot procedure.
Unfortunately, this 1995 BIOS is too limited to add further CPU support.

Then we tried the latest 2112C800 BIOS.
This BIOS has Pentium MMX, Pentium Overdrive MMX, and AMD K5 support. It even knows the first K6 model 6 (the 2.9V/3.2V Vcore version).
However, this 2112C800 BIOS only worked reliably with the P54 and K5 CPUs. As soon as a CPU with MMX was installed, it hung at POST_0D.

After a lot of troubleshooting, and testing by scorp, I found a bug in the chipset programming in POST step 0D. After fixing this bug, scorp’s PA-2000 board worked fine with the Pentium MMX and a 3.2V K6/233ANR on this patched 2112C800 BIOS. 😀

Here is this PA-2000 2112C800 patch J0.6 beta BIOS with MMX fix.

This J0.6 BIOS is still an interim version and supports the Pentium, Pentium ODP MMX, Pentium MMX, and AMD K5. Also the original K6 model 6 is supported, but the BIOS shows this CPU as a K5. Maybe I will fix this in a future version.
But despite the 1999 date of this Y2K ready 2112C800 BIOS, it is essentially a 1996 core BIOS for Socket 5, with all the limitations of that era.
So maximum 8GB IDE HDD support and the CPU speed support is limited to 233MHz.

Please let us know if this patch J0.6 BIOS fixes your Pentium ODP MMX problem.

Greetings, Jan

Thanks for the help Jan.

I will definitely install it on the board and try it out.
In any case, it is already something to look forward to.
Do you think it would be possible to include the 'highscreen' logo as well? from a VBS version of the bios) (or make a special VBS version to include this `highscreen` boot logo) Like using the one you already edited and then save it as VBS version like VBS 2112 custom.

I am specifically working on a 'highscreen' build. And I want to make it look as authentic.

I've also been playing around with a PA-2002 board.
This recognizes the Pentium Overdrive 166 MHz as a normal Pentium classic 167 MHz. (P54 model)
Although I do run into certain limitations that this board offers.
The CPU socket is located quite low, so it cannot accommodate very long ISA cards.

In the meantime I ordered a FIC-PT2003 in the hope of being able to do something more with it. Want to be able to put at least a 150 MHz Pentium on it. I want to put a 3dfx voodoo 1 in it and it still needs a slightly faster CPU.

I would prefer to be able to run the games at 640x480 resolution.
Because at 320x200 it is better to stay on a 486 machine.

A faster then 166 Mhz machine isnt really not needed.. Overall i also have more computers that can do that task when i needed a faster machine.

The next fastest machine is a Pentium II 350Mhz.. And will do the fastest Pentium 166 - 233 MMX area as well.

I bought the FIC PT-2003, because it seems that Pipeburst cache is the way to go for. The board will support both (Yes you have to choose which one to use, both cant) But when needed have an option to return to a-sync cache.