🚀 go-pugleaf

Mick Costa <mick.costa@fmr.com.no.spam> wrote:

>Gary lake wrote:
>> 
>> I have a K5PR133 on the SIS-5571 based GA-586S MB. This MB supports a
>> bus speed of 75Mhz (and possibly 83Mhz).
>> 
>> The manual is a bit confusing on what is required for this speed so I
>> tried the speed settings for a Cyrix 200+ but the system locks up just
>> after a startup msg of AMD K5PR133 at 110Mhz.
>> 
>> Also I thought the K5 family had a fixed multiplier but for normal setup
>> ie 66Mhz bus, the setting in the MB manual is for x2 ??
>> 
>> Has anyone sucessfully run this MB/CPU combination at 75Mhz.??
>> 
>> Any hints appreciated.
>> 
>> Gary

>I also have the 586S board and have similar questions about running
>non-Cyrix CPUs at 75 Mhz (and also 83 Mhz). From reading through the
>manual, it looks like the JP4, JP3, JP2, and JP10 jumpers are used to
>set the bus speed, and JP8 is for the multiplier.  

>The jumper I cannot figure out is JP11 which is set to 1-2 for
>everything except the P200+.  Did you set it to 2-3 or leave it at 1-2
>for the K5PR133?  I find it strange that it get's left at 1-2 for 50,
>55, 60, and 66 Mhz bus speeds and only changes for the P200+ (75 Mhz but
>speed).  That made me think that it has more to do with the P200+ than
>the bus speed or the fact that it is a Cyrix.  

>Anyone know the facts?

>Mick Costa

I have a 586S.
There is a chart printed on the board itself that gives the settings
for the various bus speeds including 75 Mhz.
There is no setting printed for 83 Mhz,  but it appears to be:
JP10 2-3, 5-6
JP11 2-3
JP4 closed
JP3 closed
JP2 open

Steve