Tyan motherboards wants bios chip \ VOGONS

Tyan motherboards wants bios chip

Topic actions

Post a reply

First post, by waterbeesje

Posted on 2023-05-13, 07:44

waterbeesje Online

Rank Oldbie

Rank: Oldbie
Posts: 681
Joined: 2020-01-06, 20:53
Location: The Netherlands

Hi!
My recent sortoff dumpster find: a Tyan S1856S Tomahawk BX.

This board is in need of a bios. Not just the software part, but also the chip itself. It's missing, never had it.

I can find the software easily here:
https://theretroweb.com/motherboards/s/tyan-s1856s#downloads

Now I just need the chip but I don't know what chip it needs. Is it some 28c128? Of 29c? Or which would work?
The manual doesn't state this.

By the way: I've got many other boards laying around which I can use as vehicle to flash the bios onto the new chip.

Thanks!

Stuck at 10MHz...

Reply 1 of 5, by bogdanpaulb

Posted on 2023-05-13, 09:55

bogdanpaulb Offline

Rank Member

Rank: Member
Posts: 317
Joined: 2022-11-15, 12:43
Location: Roumania

From this picture: https://www.google.com/search?q=Tyan+S1856S+T … =Zi1ykbCbbEPJZM it' should be a Winbond chip. Any 2 Mbit(256x8) flash ic in a dip32 package should work like: https://pdf1.alldatasheet.com/datasheet-pdf/v … 9F002UP12B.html, https://pdf1.alldatasheet.com/datasheet-pdf/v … 002NT-55JC.html or http://www.datasheet39.com/PDF/543905/F29C510 … -datasheet.html and there are many others. Check on your spare parts/defective boards, if you have any, for a similar ic. Mind the pinout/key !

Reply 2 of 5, by AmiSapphire

Posted on 2023-05-13, 16:46

AmiSapphire Offline

Rank Member

Rank: Member
Posts: 110
Joined: 2016-07-12, 15:01
Location: Detroit, MI

Yeah, original BIOS chip is a Winbond W29c020 IC. Theoretically, any 29C variant chip would work on this board.

https://pdf1.alldatasheet.com/datasheet-pdf/v … D/W29C020C.html

Site update: cwcyrix.duckdns.org -> cwcyrix.nsupdate.info due to the former no longer working.

Reply 3 of 5, by smtkr

Posted on 2023-05-13, 23:15

smtkr Offline

Rank Member

Rank: Member
Posts: 242
Joined: 2022-05-20, 01:27

I hope you get that working. I love Tyan motherboards.

Reply 4 of 5, by waterbeesje

Posted on 2023-05-14, 05:39

waterbeesje Online

Rank Oldbie

Rank: Oldbie
Posts: 681
Joined: 2020-01-06, 20:53
Location: The Netherlands

Thanks, i know which one I'm gonna search for now 😀

It would be a pity if this one would be recycled just because of the missing bios, it's a nice board indeed!

Stuck at 10MHz...

Reply 5 of 5, by Repo Man11

Posted on 2023-05-14, 06:19

Repo Man11 Offline

Rank Oldbie

Rank: Oldbie
Posts: 1852
Joined: 2013-04-23, 01:56
Location: California

I was lucky enough to pick up a Tyan S1854 as part of a lot I purchased for $50.00. When it didn't POST, I took the BIOS chip out and reflashed it in my programmer and it worked fine - I guess maybe it had a bad BIOS flash and ended up being stowed away.

"I'd rather be rich than stupid" - Jack Handey

Go to top of page Go to top of page

Back to General Old Hardware

Main menu

Common searches