Looking for documentation/info

From: David Woyciesjes <DAW_at_yalepress3.unipress.yale.edu>
Date: Tue Oct 9 08:54:50 2001

! >>Sounds like a 486SX/25 system upgraded to a DX2/50 with an
! OverDrive chip.
! >
! >Or somebody stuck in a DX-50 and its just running at 25 MHz.

I ran an Evergreen test program on it last night. It said it was running at
50MHz, internally?

! If the chip inserted into the other socket is a plain DX-50
! then it would be just running at 25mhz. The insertion of the DX-50
! or a 487 'coprocessor' would've disabled the SX-25 as well, if it was
! left installed. Too bad the DX-50 got such a bad rap for heat
! problems early on.
!
! BTW, does anyone know how the mainboard tells the difference
! between the 486SX and a 486DX/487? Just looking at them, there
! aren't any pin differences externally, at least between the 486DX-33
! and 486SX-25 I have sitting here.

        IIRC, it's how you set the jumpers for the clock multiplier, for the
speed; and it does some sort of detection test for the numeric processor. I
think...
        These clock speed jumpers are what I'd like to identify first. I
have a DX4/100 just sitting here. Then, I want to identify the purpose of
the other 20+ jumpers on this board...

--- David A Woyciesjes
--- C & IS Support Specialist
--- Yale University Press
--- mailto:david.woyciesjes_at_yale.edu
--- (203) 432-0953
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Received on Tue Oct 09 2001 - 08:54:50 BST