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Dual CPU Socket 5/7 Boards

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Reply 40 of 70, by Predator99

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It works....! Didnt expect this as its very dirty and some caps look really damaged 😀

Runs only with that power converter card, really lucky I had this one in spare..!

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Reply 44 of 70, by Sphere478

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Explain this power converter card to me please? That’s just for the pci right? Or for the cpu? So are there unused pins on 5v pci and this card dumps the 3.3v into those pins that were later used for 3.3v in later pci versions?

Does the Tyan S1563 Tomcat Dual Socket 7 AT Motherboard require a power card?

Anyone have one if so?

Also, following this thread with interest.

Also, since there are so many dual boards in this thread, anyone else willing to try this?
Dual amd K6 computer

🖥Fastest socket 7 build on a 430tx chipset
🖥Dual socket 7 build

Reply 45 of 70, by douglar

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Sphere478 wrote on 2021-01-17, 16:48:

Explain this power converter card to me please?

The board accepts 3.3V Pentium CPUs, but doesn't have voltage regulators on the motherboard to convert 5v AT power to 3.3V.

Looks like they give you two options:
1) use a power supply that can provide 3.3v and plug 3.3v into the alternate power connectors
-- or --
2) use a voltage regulator card that that fits into a PCI slot. Seems like the card takes current from the PCI 5v pins and feeds it back into the PCI 3.3V pins.

Reply 46 of 70, by Sphere478

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douglar wrote on 2021-01-18, 16:05:
The board accepts 3.3V Pentium CPUs, but doesn't have voltage regulators on the motherboard to convert 5v AT power to 3.3V. […]
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Sphere478 wrote on 2021-01-17, 16:48:

Explain this power converter card to me please?

The board accepts 3.3V Pentium CPUs, but doesn't have voltage regulators on the motherboard to convert 5v AT power to 3.3V.

Looks like they give you two options:
1) use a power supply that can provide 3.3v and plug 3.3v into the alternate power connectors
-- or --
2) use a voltage regulator card that that fits into a PCI slot. Seems like the card takes current from the PCI 5v pins and feeds it back into the PCI 3.3V pins.

that’s cool. Lol. Thanks for explaining!

🖥Fastest socket 7 build on a 430tx chipset
🖥Dual socket 7 build

Reply 47 of 70, by Sphere478

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btw incase anyone is wondering

undocumented voltage settings for tyan tomcat s1564 are as follows

vd0 vd1 vd2 vd3

no no no no 1.2v
yes no no no 2.15v
no yes no no 2.25v
yes yes no no 2.35
no no yes no 2.45v
no yes yes no 2.65v
yes yes yes no 2.75v

in addition to documented settings of:
no no no yes 2.8v
yes no no yes 2.9v
no no yes yes 3.2v
yes no yes yes3.3v
no yes yes yes 3.4v
yes yes yes yes 3.5v

as you can see the voltage of 2.15 should be good for k6+ cpus and probably tillamook

it appears there is also a VIO jumper that should be installed for dual voltage chips if i am reading the manual correct.

voltage can be checked between the computer case for ground and the forward most fet where the flat large metal part on the back of the fet is soldered to the board

I think there is a undocumented setting for (yes yes no yes) but didn’t test it. It’s probably one of the mid-high range settings.

fsb setings
j13
50mhz fsb 1-2,3-4
60mhz fsb 3-4
66mhz fsb 1-2
?? mhz fsb no jumper (no post)
?? mhz fsb 2-3 (didn't try)

multiplier settings
j19 j20 j21
1.5x/3.5x no,no,no
2.0x yes,no,no
2.5x yes,yes,no
3.0x no,yes,no

tried dual k62 (one 366 and one 500) both were 2.2v cpus one boots and bios sees as k6, two won't post. performed test on 2.15v and 2x multi(6x setting)
tried a k62+ 570 boots works fine on 2.15v and 2x multi(6x setting) bios detects at 66mhz 486 but it's running at 66x6 (4oo) in reality.
tried a tillamook 266 bios detects as tillamook runs fine at 233 had to jump the pins on the cpu package to get cache working, jumping the pins on the cpu to make 4x work doesn't seem to have worked seems to be at 3.5x
tried a tillamook in primary socket and a 233mmx in the second socket, it boots but no two processor detection in bios

768mb is achievable and stable by installing 128mb edo 60ns simms in slots 3-8 but 1gb will not post using all slots.

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Last edited by Sphere478 on 2021-02-04, 16:47. Edited 9 times in total.

🖥Fastest socket 7 build on a 430tx chipset
🖥Dual socket 7 build

Reply 51 of 70, by Sphere478

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majestyk wrote on 2021-01-29, 15:00:

This is one of the first Dual S7 boards I got:

ASUS_P_E-P55T2P4D.JPG

In the flesh it´s quite huge.

Dude, that board is awesome. It’s not socket 5?

The inclusion of 30 pin simms is confusing me but that does look like a 430hx chipset. Where is your coast module?

🖥Fastest socket 7 build on a 430tx chipset
🖥Dual socket 7 build

Reply 52 of 70, by majestyk

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That´s dual voltage -> Socket 7.
There are no 30-pin Sockets, they´re all 72-pin SIMM, but the lower four slots provide a 45° position for the RAM sticks.
And you are right about HX!
If memory (sic!) serves me right you need a v.3 (or higher) COAST stick for this board. I have a 512KB stick for this board somewhere.

Reply 54 of 70, by majestyk

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It used to work perfectly when I acquired it about 15 years ago.
However, the Dallas Clock battery (date code 1995) will probably be EOL by now.
I need to fit in a DIL socket and replace the "DS17487-5" which is still being produced and available. If features 4KB of extended NV-SRAM for EISA settings.
I also need a "DS1387 RAMIFIED" (also with 4KB of extended NV-SRAM for one of my FIC EISA boards) that seems to be out of production.

Reply 55 of 70, by Sphere478

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majestyk wrote on 2021-01-30, 08:37:
It used to work perfectly when I acquired it about 15 years ago. However, the Dallas Clock battery (date code 1995) will proba […]
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It used to work perfectly when I acquired it about 15 years ago.
However, the Dallas Clock battery (date code 1995) will probably be EOL by now.
I need to fit in a DIL socket and replace the "DS17487-5" which is still being produced and available. If features 4KB of extended NV-SRAM for EISA settings.
I also need a "DS1387 RAMIFIED" (also with 4KB of extended NV-SRAM for one of my FIC EISA boards) that seems to be out of production.

I just ordered one of these for my tyan board
https://monotech.fwscart.com/DS12887_RTC_Drop … 4_19810725.aspx

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🖥Fastest socket 7 build on a 430tx chipset
🖥Dual socket 7 build

Reply 56 of 70, by luckybob

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Wrong Dallas chip, sphere478.

Eisa uses a special one majestyk mentioned. The oin cell mod might still work, but its highly likely use different pins.

It is a mistake to think you can solve any major problems just with potatoes.

Reply 57 of 70, by Sphere478

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luckybob wrote on 2021-01-30, 11:28:

Wrong Dallas chip, sphere478.

Eisa uses a special one majestyk mentioned. The oin cell mod might still work, but its highly likely use different pins.

If you contact the guy, I think he may have multiple models. I confirmed with him that mine was correct. Can’t hurt to check if you like the option. 😀

🖥Fastest socket 7 build on a 430tx chipset
🖥Dual socket 7 build