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NexGen VLB motherboard settings

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Thandor

Joined: 06 Oct 2008
Posts: 461

Posted: Sun Nov 16, 2014 8:39 am Post subject: NexGen VLB motherboard settings

I'm currently benchmarking my NexGen CPU. I have a standard NexGen VLB motherboard and my P90 CPU runs fine on it. However, I'm not sure of the JP3 jumper settings and I also would like to test it on P80 and P100 speeds. Who knows the correct settings for P80, P90 and P100? (Read from left to right = read from VLB slot to 'battery') For P80?: O-O-O-C (Open, Open, Open, Closed) For P90?: C-O-C-O (Closed, Open, Closed, Open) Thanks! _________________ thandor.net - hardware And the rest of us would be carousing the aisles, stuffing baloney.

frag_

Joined: 17 Nov 2008
Posts: 4015
Location: Estonia

Posted: Sun Nov 16, 2014 8:51 am Post subject:

Maybe this can help you: http://www.planet3dnow.de/vbulletin/showthread.php/294949-NEXGEN-Thread!?p=4271525&viewfull=1#post4271525

mtx500

Joined: 21 Nov 2003
Posts: 117
Location: Nuremberg, Germany

Posted: Mon Nov 17, 2014 5:12 pm Post subject: Re: NexGen VLB motherboard settings

Thandor wrote:

Who knows the correct settings for P80, P90 and P100?

These four jumpers are input signals for the IC (Integrated Circuit) W42C26-16 from IC WORKS Inc. (bought by Cypress Semiconductor Corp. in 1999).
The data sheet is available e.g. here http://www.datasheets360.com/pdf/-3302951460039323700 or here http://www.datasheet.hk/view_download.php?id=1773846&file=0388\w42c26-14p_3888498.pdf.
See the table at page 3. This IC controls the NexBus frequency, and the Nx586 CPU always internally doubles this clock, so you have to multiply each value in the data sheet table by two.

This results in:
JP3 CPU frequency. Jumper 1 is the left-most one when holding the board with the ISA/VL slots to the left.
X = jumper inserted, O = no jumper.

Code:

Jumper
1 2 3 4 MHz
================
X X X X 60
O X X X 62
X O X X 66.6
O O X X 69
X X O X 70
O X O X 71
X O O X 72
O O O X 75
X X X O 77
O X X O 80
X O X O 84
O O X O 87
X X O O 90
O X O O 93
X O O O 97
O O O O 100

Thandor

Joined: 06 Oct 2008
Posts: 461

Posted: Wed Dec 24, 2014 4:35 pm Post subject:

Many thanks frag_ and mtx500! Exactly what I needed . _________________ thandor.net - hardware And the rest of us would be carousing the aisles, stuffing baloney.

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