Looking for documentation/info

From: Jeff Hellige <jhellige_at_earthlink.net>
Date: Mon Oct 8 22:07:02 2001

> >> From: David Woyciesjes <DAW_at_yalepress3.unipress.yale.edu>
>>> Date: Mon, 8 Oct 2001 16:49:55 -0400
>>>
>>> I have a Unisys 486 computer. It's a SX-25, with a DX-50 in it also.
>>> It's mfg date is 10/92, and style number is SG-3102-425. It's "plateau" is
>>> labelled Evaluation Unit A. That would explain the XXXX in the FCC ID
>>> field...
>>> On the motherboard itself, it has a sticker with...
>>> 43611896-000
>>> PW300 486SX/25
>>> 9240 AVEX
>>
>>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.

        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.

        Jeff
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Received on Mon Oct 08 2001 - 22:07:02 BST

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