Motherboard pictures.

Do you know if the flasher updated the BIOS Boot Block (usually they are not updated BUT some BIOS updates require it) ? Did you load BIOS "Setup Defaults" after flashing ?
Which BIOS did you flash it too ? You probably should put a battery in it....

Horun wrote on 2020-10-03, 22:53:

Do you know if the flasher updated the BIOS Boot Block (usually they are not updated BUT some BIOS updates require it) ? Did you load BIOS "Setup Defaults" after flashing ?
Which BIOS did you flash it too ? You probably should put a battery in it....

Hey!

Board is in storage, so no battery left in the socket.

I updated the bios like 15+ years ago (at least), I don't remember what I did that time 😀
I could reflash the bios as I wouldn't damage it.

Strange. I'd try reflashing the BIOS using UniFlash.

I have uploaded your photos here : http://www.win3x.org/uh19/motherboard/show/6048
Moreover, we have uploaded all the bioses we could find for your board 😀

Please, just a question. Does have this version Explorer IV Speedeasy BIOS menu? I don't see any jumpers for setting up multiplier and FSB speed.
Strangly, on PCB, there are markings for setting jumpers, and even 75 FSB speed. Here, 75 FSB speed is not among listed http://www.win3x.org/uh19/motherboard/show/6048

W.x. wrote on 2021-02-22, 23:48:

Please, just a question. Does have this version Explorer IV Speedeasy BIOS menu? I don't see any jumpers for setting up multiplier and FSB speed.
Strangly, on PCB, there are markings for setting jumpers, and even 75 FSB speed. Here, 75 FSB speed is not among listed http://www.win3x.org/uh19/motherboard/show/6048

The corresponding jumpers are in the lower left corner in the picture.
The manual even shows the setting for 83MHz FSB.
The chipset only officially supports up to 66MHz FSB and does not offer dividers for higher speeds so maybe that's why the avaliable FSB settings aren't listed as supported on win3x.org even though they're listed in the manual?

Doornkaat wrote on 2021-02-23, 02:59:

The manual even shows the setting for 83MHz FSB.
The chipset only officially supports up to 66MHz FSB and does not offer dividers for higher speeds so maybe that's why the avaliable FSB settings aren't listed as supported on win3x.org even though they're listed in the manual?

According to this Anandtech article busspeeds of 68, 75, 83.3 MHz are 'unofficially achieved'.
https://www.anandtech.com/show/72/7
With this particular board, who knows...

PARKE wrote on 2021-02-23, 13:10:

According to this Anandtech article busspeeds of 68, 75, 83.3 MHz are 'unofficially achieved'. https://www.anandtech.com/show/7 […]
Show full quote

Doornkaat wrote on 2021-02-23, 02:59:

The manual even shows the setting for 83MHz FSB.
The chipset only officially supports up to 66MHz FSB and does not offer dividers for higher speeds so maybe that's why the avaliable FSB settings aren't listed as supported on win3x.org even though they're listed in the manual?

According to this Anandtech article busspeeds of 68, 75, 83.3 MHz are 'unofficially achieved'.
https://www.anandtech.com/show/72/7
With this particular board, who knows...

That means pc-100 ram, but my specific model can't boot with pc-100 ram no matter he density and rows.
I might try again in the future with different cpus.

PC100 SDRAM should theoretically be backwards compatible but there was a lot of variation in quality in the early days.
Maybe it is a BIOS issue ? I used to have this exact board in the past and as far as I remember (not 100% sure though) it worked with both pc66 and pc100 sticks.

PARKE wrote on 2021-02-24, 12:37:

PC100 SDRAM should theoretically be backwards compatible but there was a lot of variation in quality in the early days.
Maybe it is a BIOS issue ? I used to have this exact board in the past and as far as I remember (not 100% sure though) it worked with both pc66 and pc100 sticks.QDI.JPG

This w/e I'm going to try out all my pc-100 sticks and see what works.
Try different fsb options.

Pity the bios chip is soldered, will have to reflash by hand - TL866 is spoiling me 😀

Edit 2024: I tried a whole bunch of PC-100 and 133. Obviously only up to 128MB. Double-sided only. Most are seen as half or a 1/4 of the capacity, but it has to do with chip density probably.
I'll test to see if it is a VX chipset thing or the RAM sticks.

Not sure if reflashing the BIOS will be effective. What I meant is that the RAM/SPD settings in the current BIOS may cause problems.