First post, by appiah4
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Got hold of this motherboard, but cant make sense of its jumpers..
Anyone can help?
Retronautics: A digital gallery of my retro computers, hardware and projects.
Got hold of this motherboard, but cant make sense of its jumpers..
Anyone can help?
Retronautics: A digital gallery of my retro computers, hardware and projects.
Pretty much every hit for this board online is people looking for the manual. Couldn't find much even on Searx.me, but a code 2A59GT4BC pointing to the same board. That didn't turn up anything productive, though. Mainly sites talking about Intel Triton stuff.
There aren't even any high res shots of the board, I will take one today. I am trying to figure it out looking at other Taken board jumper settings and manuals. The one thing I am sure of is that J1 and J2 together, below the CPU socket, are the 3.3v/2.8v Vcore toggle; close both and it's 3.3V, open both and it's 2.8V.
JP8 and JP9 (actually a 2x3 jumper) are apparently somehow the FSB and multiplier, or possibly just the multiplier. This will take some experimenting. Luckily I have a lot of P54C/P55C CPUs to work with. I can't do it this weekend though.
Retronautics: A digital gallery of my retro computers, hardware and projects.
Heres a better shot of the motherboard as it appears to be nonexistant on the web.
Retronautics: A digital gallery of my retro computers, hardware and projects.
Here's what I think the jumpers are for:
J1/J2: Vcore
Open: 2.8V
Short: 3.3V
JP5: Cache (You can use the turbo button header on 1-2 to enable/disable cache at will)
Open: 256K
1-2: 0K
2-3: 512K
JP7/JP8: FSB
JP7 JP8
1-2 1-2 66 Mhz
1-2 2-3 75 Mhz
2-3 1-2 60 MHz
2-3 2-3 50 MHz
JP9: Multiplier
1-2 4-5 1.5x/3.5x
1-2 5-6 2x
2-3 5-6 2.5x
2-3 4-5 3x
Retronautics: A digital gallery of my retro computers, hardware and projects.
wrote:Here's what I think the jumpers are for: […]
Here's what I think the jumpers are for:
J1/J2: Vcore
Open: 2.8V
Short: 3.3VJP5: Cache (You can use the turbo button header on 1-2 to enable/disable cache at will)
Open: 256K
1-2: 0K
2-3: 512KJP7/JP8: FSB
JP7 JP8
1-2 1-2 66 Mhz
1-2 2-3 75 Mhz
2-3 1-2 60 MHz
2-3 2-3 50 MHzJP9: Multiplier
1-2 4-5 1.5x/3.5x
1-2 5-6 2x
2-3 5-6 2.5x
2-3 4-5 3x
Did you confirm the 75MHz setting? Because the ICS9159M-14 chip only supports 50, 55, 60 and 66MHz bus speed.
Unconfirmed as of yet these arenhypothetical.. I will test these out next week.
However, if you look at the board shots above, the second one is by me and taken from a working PC (presumably) with warranty stickers from the same OEM builder, J1/J2 Vcore is almost a sure bet.
J1/J2: Vcore
Open: 2.8V
Short: 3.3V
As for JP9, it's the same for both Pentium and MMX CPUs, I would presume the 2-3, 4-5 setting is 66MHz, and that translates into FS1 0, FS 1 as per the table you linked:
That means FSB is actually related to J9, and the correct FSB settings should be:
JP9: FSB
1-2 4-5 55 MHz
1-2 5-6 60 MHz
2-3 4-5 66 MHz
2-3 5-6 50 MHz
As for JP7/JP8, they have to be multiplier settings then.
JP7/JP8: Multiplier
JP7 JP8
1-2 1-2 2.5x
1-2 2-3 ??x
2-3 1-2 ??x (Judging by the other photo of this board online, a multilied that a P54C would use at 66MHz, most probably 1.5x as Taken boards don't seem to have 2x for Intel CPUs if TH99 is to go by..)
2-3 2-3 ??x
Retronautics: A digital gallery of my retro computers, hardware and projects.
Right, so I used this board in my P133 build and got around to testing its jumpers. Leaving this here in case anyone needs it in the future:
J1/J2: Vcore (as guessed)
Pinout for J1/J2
2 2
1 1
^ ^
Open: 2.8V
2 2
1 1
^ ^
Short: 3.3V
X X
| |
X X
^ ^
JP9 controls the FSB.
Pinout for JP9:
2 4 6
1 3 5
^
JP9: 50MHz FSB
2 X-X
1 X-X
^
JP9: 55MHz FSB
X-X 6
X-X 5
^
JP9: 60MHz FSB
X-X 6
1 X-X
^
JP9: 66MHz FSB
2 X-X
X-X 5
The board has no multiplier setup; it runs with what the CPU reports apparently.
Contrary to my hypothesis, JP7 and JP8 appear to have nothing to do with the multiplier. The board refuses to boot at 2-3 for me, but the only other photo of this board on the net has it on 2-3 so make of that what you will.
JP8 on 1-2 or 2-3 had no effect for me, but it might be CMOS clear (it did not occur to me to try the jumper with the power disconnected.)
Retronautics: A digital gallery of my retro computers, hardware and projects.