Re: IDT Winchip 2A PR266 a.k.a "Weirdo"

Anyone have a functioning setup live at the moment for a test?

Sphere478 wrote on 2024-02-27, 13:35:

Re: IDT Winchip 2A PR266 a.k.a "Weirdo"

Anyone have a functioning setup live at the moment for a test?

I don't know what you want to test, but both the rig from the linked thread and one with a modded Tillamook on a MVP3 mb with cache are running here.

JustJulião wrote on 2024-02-28, 18:51:

Sphere478 wrote on 2024-02-27, 13:35:

Re: IDT Winchip 2A PR266 a.k.a "Weirdo"

Anyone have a functioning setup live at the moment for a test?

I don't know what you want to test, but both the rig from the linked thread and one with a modded Tillamook on a MVP3 mb with cache are running here.

Was curious about the response from the chip when intel bf2 was pulled high. Changing bf0, bf1.

From what I recall, intel bf2 basically defaults to pull down when floating.

And when bf2 is pulled down bf0,1 provide 133-233 mhz options.

But when intel bf2 is pulled high the chip always is at 266 no matter what bf0,1 are set to.

If someone can verify that. Not with my setup atm.

https://www.ebay.com/itm/176350362839

166mhz tillys spotted

Hi guys.

Does anyone know if the Tillamook 266mhz will work on a Asus p5a-b ?

Had a guy that made the mods on the cpu for me but no luck getting it to post.

Show picture of mods are, update, bios, have you verified the voltage is correct

I'm thinking of modding one of my Tillamook 266 CPUs, but after skimming through the thread, it's still unclear to me if the 4x multiplier mod would actually lock it to 4x (as in, without the possibility of selecting lower multipliers, which would be unacceptable to me).
FYI, I'd like to use it on an Asus TX97-XE (430TX ATX board) that I just repaired, which does not have a 4x setting. This board is rock solid at 83 MHz FSB, which means that 333 MHz is achievable with an unlocked 4x multi, but I absolutely need those lower multipliers as well.

Umm, I believe if you follow the pic guide I modified and posted some pages back you will be able to use all supported on ss7 mobos, but it will probably be 4x all the time on s7 mobos.

Look in my sig for projects that can add ss7 functionality to your mobo.

The processor shim may be a good one for you.

bloodem wrote on 2024-05-23, 14:28:

I'm thinking of modding one of my Tillamook 266 CPUs, but after skimming through the thread, it's still unclear to me if the 4x multiplier mod would actually lock it to 4x (as in, without the possibility of selecting lower multipliers, which would be unacceptable to me).
FYI, I'd like to use it on an Asus TX97-XE (430TX ATX board) that I just repaired, which does not have a 4x setting. This board is rock solid at 83 MHz FSB, which means that 333 MHz is achievable with an unlocked 4x multi, but I absolutely need those lower multipliers as well.

The 4x multiplier is toggled with the intel BF2 cpu pin. Which is actually different from what super socket 7 motherboards expect to be the BF2 pin.
See 243571-002.pdf linked in this topic, page 18: Tillamook- Aiming For The Stars!

The mod links intel bf2 to ss7 amd/cyrix bf2 which is why I said a ss7 mobo would drive bf2 properly if modded how I described in that modified pic guide.

Thanks guys, will try my luck and see how it goes. 😀

bloodem wrote on 2024-05-24, 05:01:

Thanks guys, will try my luck and see how it goes. 😀

Well, made it work, but not how I had hoped. In my case, the red connection "L2 (required on some boards)" actually prevented the system from posting ("----" on the post analyzer card).
Also, I'm now stuck with the 4x multiplier 😢 . But, man, it sure is fast at 333 MHz, even when running on the 430TX chipset! My particular chip is perfectyl stable at this frequency @ 2.1V.
Will dig deeper when I get the chance.

bloodem wrote on 2024-05-26, 09:33:

Well, made it work, but not how I had hoped. In my case, the red connection "L2 (required on some boards)" actually prevented th […]
Show full quote

bloodem wrote on 2024-05-24, 05:01:

Thanks guys, will try my luck and see how it goes. 😀

Well, made it work, but not how I had hoped. In my case, the red connection "L2 (required on some boards)" actually prevented the system from posting ("----" on the post analyzer card).
Also, I'm now stuck with the 4x multiplier 😢 . But, man, it sure is fast at 333 MHz, even when running on the 430TX chipset! My particular chip is perfectyl stable at this frequency @ 2.1V.
Will dig deeper when I get the chance.

That's 83 fsb? Everything must be crazy fast then, if IDE controller etc holds up to that 41 MHz pci

H3nrik V! wrote on 2024-05-26, 10:05:

That's 83 fsb? Everything must be crazy fast then, if IDE controller etc holds up to that 41 MHz pci

Yeah, it's amazing to see games like NFS 4 High Stakes being extremely playable at this frequency (in conjunction with a Voodoo 3 PCI).

bloodem wrote on 2024-05-26, 09:33:

Well, made it work, but not how I had hoped. In my case, the red connection "L2 (required on some boards)" actually prevented th […]
Show full quote

bloodem wrote on 2024-05-24, 05:01:

Thanks guys, will try my luck and see how it goes. 😀

Well, made it work, but not how I had hoped. In my case, the red connection "L2 (required on some boards)" actually prevented the system from posting ("----" on the post analyzer card).
Also, I'm now stuck with the 4x multiplier 😢 . But, man, it sure is fast at 333 MHz, even when running on the 430TX chipset! My particular chip is perfectyl stable at this frequency @ 2.1V.
Will dig deeper when I get the chance.

Most ppga I’ve seen can do 400 at 2-2.1

Sphere478 wrote on 2024-05-26, 20:14:

Most ppga I’ve seen can do 400 at 2-2.1

Yeah, it's very likely that it also works fine at 2.0, but I just went with 2.1, because the CPU is still stone cold at this voltage. In fact, I'm thinking of making this my first 100% passively cooled build.

Later Edit: Yep, confirmed stable at 2.0V. I was just lazy and went straight to 2.1V. 😀

bloodem wrote on 2024-05-27, 07:19:

Sphere478 wrote on 2024-05-26, 20:14:

Most ppga I’ve seen can do 400 at 2-2.1

Yeah, it's very likely that it also works fine at 2.0, but I just went with 2.1, because the CPU is still stone cold at this voltage. In fact, I'm thinking of making this my first 100% passively cooled build.

Later Edit: Yep, confirmed stable at 2.0V. I was just lazy and went straight to 2.1V. 😀

Cpu being cool doesn’t mean the voltage is good.

But 2-2.1 is fine. Wouldn’t go much higher though.

Sphere478 wrote on 2024-05-27, 11:30:

Cpu being cool doesn’t mean the voltage is good.

In my experience, they are very closely linked. I've yet to see an overvolted CPU (be it retro or modern) that stays 'cool'.

Sphere478 wrote on 2024-05-27, 11:30:

But 2-2.1 is fine.

Uhm, 2.0V is more than fine. It's the official/in-spec voltage for the 266 MHz Tillamook. 😀

Greetings all-

Hope this isn't too much of a necro but...

I finally had a chance to test my modded Tillamook 266Mhz and had some success I wanted to share. I've been able to run the board at 266Mhz, 300Mhz, 350Mhz and now 400Mhz now that I found the correct jumper config for the 4x multiplier on this particular board. L2 cache is detected and functional.

The only thing is that my Speedsys score seems lower than similar setups with 4X x 100FSB. Thoughts?

Processor: Intel Pentium 266 w/MMX "Tillamook"
Motherboard board: Asus P5A Rev. 1.06 (512KB L2 Cache)
Memory: 1x128MB PC100 SDRAM
BIOS: 1011 Beta 005

Processor Mods:

• Green (VCC2DET)
• Yellow (L2 Cache)
• Blue (BF2 4X Multi)

Jumper Config:

This board does not have a documented 4X multi jumper config for P55C processors. None of the jumper configs presented in the manual for BF0, BF1 and BF2 worked, but the following config sets the multi at 4X:

CPU BUS Frequency Multiple (4x):

• BF0: 1-2 short
• BF1: 2-3 short
• BF2: 1-2 short

FSB (100Mhz)

• FS0: 1-2 short
• FS1: 1-2 short
• FS2: 1-2 short
• FS3: 2-3 short

Voltage (2.2V)

• VID0: 1-2 short
• VID1: 2-3 short
• VID2: 1-2 short
• VID3: 1-2 short

Weird but the p5a 1.05 and 1.06 are notorious for being bugged with k6-x+ cpus maybe something similar happens with this one?
Do you have any other ss7 motherboard to try with?