I had a crack at the cyrix chip but didnt have much luck. Ill let you know how it goes in the um8810.

I think for now this system is finished!

The only thing that is on my nerves is that the Turbo Switch cable from the case is 3 pin but the motherboard connector is 2 pin so Im unable to get it working - Plugging in just two of the pins takes my PC down to 4mhz which cant be right surely 😀

Thanks for all your help.

Specs are as follows:

TSENG LABS ET4000/W32I VESA 32-BIT 2 MB DRAM
Intel 486DX4-100 Overdrive CPU
KUO SHENG VLB/ISA Motherboard (ASAKI Chipset)
64 MB Fast Page Ram
Unknown VLB Model IO Controller - UMC Chipset
CT1600 Sound Blaster Pro 2
CT1740 Sound Blaster 16 (MT32/SC55 interface)
Maxtor 1.01 GB Hard disk
Seagate Medalist 10GB Hard disk (jumpered to 2.1)
Mitsumi Quad Speed CDROM - FX400E
Generic 3.11 Disk Drive
Generic Serial Mouse
Honeywell Litetouch Keyboard
Microsoft Sidewinder Joystick
Pro Tech 486 Case
Hansol 920P 19inch CRT Monitor
Roland SC-55
Roland MT-32
MS-DOS 6.22

The turbo cable plug should be easy to mod. Just use a clipper to separate them into two individual ones 😀

Turbo does a lot of things on many boards, disabling cache, introducing wait states. I believe it's meant to be compatible with 4.77MHz type applications.

Very nice build I must say 😀

Where is the best place to source 1024k cache for a 486 board and what part numbers do I need?

feipoa wrote:

Anonymous Coward wrote:

It appears that your 5x86 is extra special, because it seems to have support for a 4X multiplier. 5x86-120 normally only has 2X/3X multipliers. If I am correct, you will be unable to run it in 2x60 mode as it has no 2X multiplier.

2X can be set in software on the 4X models. But what makes you think it is 4X-enabled? I thought the Cyrix 5x86-120/4x chips had "4x" printed on the ceramic top?

rgart, are you able to determine what multiplier your 120 is capable of? If not, perhaps when you find a more suitable motherboard...

How is this done?

rgart wrote on 2013-04-26, 21:26:

RacoonRider wrote:

Can you tell us the BIOS string?
(C) American Megatrends Inc.,
40-POA1-001926-00101111-101094-CS8006-H

Hi all - I am trying to repair one of these Asaki boards (chipset with 4H006 printing). Can anyone please provide a BIOS image for the above, or anything using the CS8006 chipset? I have looked as far as I am capable, found a few mentions of the BIOS, but so far found no downloadable images. Thanks in advance, I'll be eternally grateful 😀

Phoenix1975 wrote on 2021-12-05, 00:06:

rgart wrote on 2013-04-26, 21:26:

RacoonRider wrote:

Can you tell us the BIOS string?
(C) American Megatrends Inc.,
40-POA1-001926-00101111-101094-CS8006-H

Hi all - I am trying to repair one of these Asaki boards (chipset with 4H006 printing). Can anyone please provide a BIOS image for the above, or anything using the CS8006 chipset? I have looked as far as I am capable, found a few mentions of the BIOS, but so far found no downloadable images. Thanks in advance, I'll be eternally grateful 😀

Yay another one. I have a working one.
I've never found a BIOS online 😒
Maybe I can dump this one for you.
Are you sure it's broken? Maybe you just need the right jumpers.

MrBuzzy wrote on 2021-12-26, 10:39:

Yay another one. I have a working one. I've never found a BIOS online :-/ Maybe I can dump this one for you. Are you sure it's b […]
Show full quote

Phoenix1975 wrote on 2021-12-05, 00:06:

rgart wrote on 2013-04-26, 21:26:

Hi all - I am trying to repair one of these Asaki boards (chipset with 4H006 printing). Can anyone please provide a BIOS image for the above, or anything using the CS8006 chipset? I have looked as far as I am capable, found a few mentions of the BIOS, but so far found no downloadable images. Thanks in advance, I'll be eternally grateful 😀

Yay another one. I have a working one.
I've never found a BIOS online 😒
Maybe I can dump this one for you.
Are you sure it's broken? Maybe you just need the right jumpers.

A BIOS dump would be awesome if you can do that for me!!! Driving me nuts not being able to find the one thing I need to finish this board.
The board had some physical damage which has now been repaired, and had the wrong BIOS chip installed (for an Opti chipset from memory verified with my EPROM programmer). I did manage to find a 486 BIOS that allowed me to enter setup and navigate around, but it would not boot as the chipset was different. Was enough to give me hope that the board is otherwise functional.
It also has the regulator for the CPU missing - which I have now bypassed - can you please tell me the markings on the regulator chip (3 pin TO220)
Thanks in advance 😀

Phoenix1975 wrote on 2021-12-26, 12:34:

can you please tell me the markings on the regulator chip (3 pin TO220)

SC
EZ1085CT
9506

MrBuzzy wrote on 2021-12-26, 23:46:

SC EZ1085CT 9506 […]
Show full quote

Phoenix1975 wrote on 2021-12-26, 12:34:

can you please tell me the markings on the regulator chip (3 pin TO220)

SC
EZ1085CT
9506

Thanks - I have one on order now. Just need a BIOS image now and hopefully have this thing alive again!

Phoenix1975 wrote on 2021-12-29, 09:55:

MrBuzzy wrote on 2021-12-26, 23:46:

SC EZ1085CT 9506 […]
Show full quote

Phoenix1975 wrote on 2021-12-26, 12:34:

can you please tell me the markings on the regulator chip (3 pin TO220)

SC
EZ1085CT
9506

Thanks - I have one on order now. Just need a BIOS image now and hopefully have this thing alive again!

What would be the reliable way to dump the bios from a running machine and know I got it all?

MrBuzzy wrote on 2021-12-30, 23:10:

Phoenix1975 wrote on 2021-12-29, 09:55:

MrBuzzy wrote on 2021-12-26, 23:46:

SC
EZ1085CT
9506

Thanks - I have one on order now. Just need a BIOS image now and hopefully have this thing alive again!

What would be the reliable way to dump the bios from a running machine and know I got it all?

I use an EPROM programmer, but I believe it can be don in DOS using UNIFLASH.

Can get a copy and try it out on one of my boards first if you need instruction. If the chip is a xxx512 it should give you a 64k file, or 128k for a xxx010 or xxx011

Phoenix1975 wrote on 2021-12-31, 12:28:

MrBuzzy wrote on 2021-12-30, 23:10:

Phoenix1975 wrote on 2021-12-29, 09:55:

Thanks - I have one on order now. Just need a BIOS image now and hopefully have this thing alive again!

What would be the reliable way to dump the bios from a running machine and know I got it all?

I use an EPROM programmer, but I believe it can be don in DOS using UNIFLASH.

Can get a copy and try it out on one of my boards first if you need instruction. If the chip is a xxx512 it should give you a 64k file, or 128k for a xxx010 or xxx011

Confirmed that “UNIFLASH -SAVE filename” works a treat and result in the same file that my programmer gets off the bios.
I used v1.40 which was easy to find. Just run it under dos with no memory managers etc running.
Good luck and thanks for your help

Phoenix1975 wrote on 2022-01-03, 00:27:

Confirmed that “UNIFLASH -SAVE filename” works a treat and result in the same file that my programmer gets off the bios. I used […]
Show full quote

Phoenix1975 wrote on 2021-12-31, 12:28:

MrBuzzy wrote on 2021-12-30, 23:10:

What would be the reliable way to dump the bios from a running machine and know I got it all?

I use an EPROM programmer, but I believe it can be don in DOS using UNIFLASH.

Can get a copy and try it out on one of my boards first if you need instruction. If the chip is a xxx512 it should give you a 64k file, or 128k for a xxx010 or xxx011

Confirmed that “UNIFLASH -SAVE filename” works a treat and result in the same file that my programmer gets off the bios.
I used v1.40 which was easy to find. Just run it under dos with no memory managers etc running.
Good luck and thanks for your help

Should we take this to a new thread?

Here's a BIOS dump to test out. I wasn't able to use uniflash it requires PCI. This one was made with NSSI.
If you can confirm it works I'll provide it to UltimateRetro.

The sticker on the chip says ISA bus. I thought it might say ISA/VLB. Not even sure VLB is active.
And my board has fake cache confirmed with cachechk.
I'm interested to know how you go.

MrBuzzy wrote on 2022-01-03, 02:58:

Should we take this to a new thread? […]
Show full quote

Phoenix1975 wrote on 2022-01-03, 00:27:

Confirmed that “UNIFLASH -SAVE filename” works a treat and result in the same file that my programmer gets off the bios. I used […]
Show full quote

Phoenix1975 wrote on 2021-12-31, 12:28:

I use an EPROM programmer, but I believe it can be don in DOS using UNIFLASH.

Can get a copy and try it out on one of my boards first if you need instruction. If the chip is a xxx512 it should give you a 64k file, or 128k for a xxx010 or xxx011

Confirmed that “UNIFLASH -SAVE filename” works a treat and result in the same file that my programmer gets off the bios.
I used v1.40 which was easy to find. Just run it under dos with no memory managers etc running.
Good luck and thanks for your help

Should we take this to a new thread?

Here's a BIOS dump to test out. I wasn't able to use uniflash it requires PCI. This one was made with NSSI.
If you can confirm it works I'll provide it to UltimateRetro.

The sticker on the chip says ISA bus. I thought it might say ISA/VLB. Not even sure VLB is active.
And my board has fake cache confirmed with cachechk.
I'm interested to know how you go.

Thanks! I think there are problems though - 0000h to 7500h is all null....

I have since found that "UNIFLASH -BASE F0000" works on a similar board that has no PCI bus - can you please give this a try?

I created this thread a while back - do we want to continue there? - Need help getting a BIOS image for 486 Asaki motherboard

update: working bios posted in the other thread.