🚀 go-pugleaf

>In article <27SEP199216045687@summa.tamu.edu> gtb6038@summa.tamu.edu (BILES, G
R
>EG THOMAS) writes:
>>I recently purchased a 387 co-processor, but I am having some second
>>thoughts about it.  Becasue, the model number is A80387-16 and it says
>>SX829 on it.  The place where I bought it from swears that it is a DX,
>>32-bit co-pro.  It works fine on my machine, but it fails to fill up the
>>outer row of pins on the socket which leads me to believe that it is
>>a 16 bit version for an SX.  Any information would be greatly appreciated.
>>
>>Greg
>
>Some motherboards (my budget 386-40, for example) have a math co-processor
>socket that will accept either a 387 or a Weitek floating-point accelerator.
>The 387 leaves two sides of holes empty, but which are filled by the pins of
>the Weitek.
>
>Motherboards typically are designed to accept only one type of 387 chip; it
>is simpler.  The SX829 might be a version or date code (someone please
>correct me).
>
>If your 386 CPU is also running at 16 MHz, I'd say stick with it.

The SX829 is a step number. Some motherboards do indeed allow either the
Weitek (with nearly twice the number of pins as the 387) or the 387. Keep
in mind that Pin Grid Array sockets are built on matrices of pins and will
have more pins than the processor that fits it most of the time. The 387
has 68 pins as I recall. If this is the case please note that 68 is not a
perfect square and there may well be more positions than pins. Some sockets
will cut out a square block of the inner pins as those are least likely
to be used.


>Andras
>
>--
>--
>Andras Radics                           (386-40 inside)
>andras@cyber.net
>