Same website, just in a different spot : http://www.elhvb.com/mobokive/Archive/PcChips … m918/index.html
A bios from december 1996 😉

also if the bios has a window below the sticker you will need UV light to erase it. normal led uv light will not work

Your BIOS chip will also be free of covid.

Deksor wrote on 2020-04-24, 23:25:

Same website, just in a different spot : http://www.elhvb.com/mobokive/Archive/PcChips … m918/index.html
A bios from december 1996 😉

Thank you so much! I peeled the label off the chip and found that it was a 27C1000PC-15. Doesn't look erasable, so what EEPROM could I look into getting to replace this? I did a bit of googling and it seems if i can find something that has the same pinout and is 128k i'm good, but I just want to make sure before buying anything. This is the first time i've done anything like this.

ninevapor wrote on 2020-04-25, 04:49:

Thank you so much! I peeled the label off the chip and found that it was a 27C1000PC-15. Doesn't look erasable, so what EEPROM could I look into getting to replace this? I did a bit of googling and it seems if i can find something that has the same pinout and is 128k i'm good, but I just want to make sure before buying anything. This is the first time i've done anything like this.

Probably you are right. If you don't want to program chip in circuit, just buy any 128kx8 flash - SST29ee010 or P28F001 or W29EE011 ...
On some older motherboards there are jumpers to set up EEPROM programming Voltage, but if you have external programmer it doesn't matter.

zyga64 wrote on 2020-04-25, 06:45:

ninevapor wrote on 2020-04-25, 04:49:

Thank you so much! I peeled the label off the chip and found that it was a 27C1000PC-15. Doesn't look erasable, so what EEPROM could I look into getting to replace this? I did a bit of googling and it seems if i can find something that has the same pinout and is 128k i'm good, but I just want to make sure before buying anything. This is the first time i've done anything like this.

Probably you are right. If you don't want to program chip in circuit, just buy any 128kx8 flash - SST29ee010 or P28F001 or W29EE011 ...
On some older motherboards there are jumpers to set up EEPROM programming Voltage, but if you have external programmer it doesn't matter.

Alright, I just bought a XGecu TL866II Plus with some W29EE011-15 proms. I'll see how this goes in a week or so when I get them in. Thanks for the help!

This board has crummy L2 cache performance. Has anyone bothered to see how another brands BIOS performs on this board?

ninevapor> can you post your Speedsys screenshot?

feipoa wrote on 2020-04-25, 23:07:

This board has crummy L2 cache performance. Has anyone bothered to see how another brands BIOS performs on this board?

ninevapor> can you post your Speedsys screenshot?

Took me a while to get it, a few of my compactflash cards didn't agree with my system. Plus, I think the floppy interface on the board is dead. I've tried using a gotek emulator, a Panasonic 3.5" fdd, and a Mitsubishi 5.25" fdd, all didn't work or even light up.

I used VMWare to install DOS on the compactflash card before booting it with the cf-ide adaptor on the board. Now that it's working, its pretty easy to move files onto the CF card but wow, that was a pain.

Thanks a lot. On my board, I didn't see any drop at the L2 cut-off level. I had 1024K installed though. Perhaps there is some bug with more cache installed.

Yeah, it is getting pretty common to have 486 boards without a working diskette controller.

I got the programmer, got the new BIOS working. 5x86-133 working great!

Only issue though, it won't accept any more than 128mb of RAM. I tried two different sets of FPM simms, one with parity, one without, and neither will show more than 128mb. Both sets are 4x64mb.
In the documentation from elhvb it says the max on this board is 256mb so i'm a bit confused. I looked through the setup to see if there was something I needed to enable, I looked through all the jumper settings too.

Thank you all for the help!

Probably a BIOS limitation. I've seen this quite a bit on these older boards.

feipoa wrote on 2020-04-27, 03:42:

Thanks a lot. On my board, I didn't see any drop at the L2 cut-off level. I had 1024K installed though. Perhaps there is some bug with more cache installed.

Yeah, it is getting pretty common to have 486 boards without a working diskette controller.

With EDO DRAM there is no drop at the L2 cut-off level. With FPM there is visible drop.

Starej_Mraf wrote on 2024-03-17, 18:20:

feipoa wrote on 2020-04-27, 03:42:

Thanks a lot. On my board, I didn't see any drop at the L2 cut-off level. I had 1024K installed though. Perhaps there is some bug with more cache installed.

Yeah, it is getting pretty common to have 486 boards without a working diskette controller.

With EDO DRAM there is no drop at the L2 cut-off level. With FPM there is visible drop.

Screenshots?

I will make some... 😀

Ok, here it is.

EDO

Hm, it seems that there is very faaast EDO or very slow cache 😀

FPM

Here you can see speed drop after 256k. Sorry I don't have any 128k x 8 SRAM modules for 1MB test.

Starej_Mraf wrote on 2024-03-18, 17:55:

Ok, here it is. […]
Show full quote

Ok, here it is.

EDO
AMD80EDO.gif
image0.jpeg

Hm, it seems that there is very faaast EDO or very slow cache 😀

FPM
AMD80FPM.gif
image1.jpeg
image2.jpeg

Here you can see speed drop after 256k. Sorry I don't have any 128k x 8 SRAM modules for 1MB test.

Thx.
I would not say that there is no speed drop with EDO, but speedsys somehow sees no drop in "read performance". And then it thinks there is no L2 cache. Cachechk has more realistic values
But you can see clearly that there is a speed-drop in moving also in speedsys, so definitely L2 cache is still doing something.
But yes the difference between RAM performance and cache seems to be small.