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Conference sutra::europc

Title:	Euro-PC Support Conference
Notice:	Stop your whinning and get back to work!
Moderator:	SUTRA::BATS

Created:	Mon Jun 12 1989
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	3826
Total number of notes:	12603

3793.0. "Venturis/AMDDX4100 problem" by SIOG::CORCORAN () Wed Feb 26 1997 14:46

    I recently upgraded a Venturis FP466 to a FP4100 by installing a
    486dx4100 AMD cpu(motherboard is 2nd version,54-24054-01)
    Bios is 2.01
    
    A strange problem occurs-If I make a bootable diskette  using the SYS
    command, I get a "non bootable disk or disk error" when I try the
    bootable disk I just made.It will boot the same diskette from a Compaq
    ok.
    
    If I reinstall the 468-66 AMD original cpu,its ok, OR if I disable the
    internal cache when using the DX4100 cpu,it works!
    
    The AMD cpu is marked A80486DX4-100SVB.
    
    Any ideas before I start swapping the m/b,CPU etc.
    
    Jumpers for DX4100    -
    J9=2-3 in
    J14=off
    J15=on
    J35=off(this was the only change when going from DX266 to DX4100)

T.R	Title	User	Personal Name	Date	Lines
3793.1	Could you try the latest BIOS v2.02	PCBUOA::LIBKIND	Sam Libkind - PC Support Engineering 276-9465	`Wed Feb 26 1997 15:08`	4
	Strange problem really. Could you try the latest BIOS v2.02 Sam Libkind PCBU Support Engineering
3793.2	one more question.	PCBUOA::LIBKIND	Sam Libkind - PC Support Engineering 276-9465	`Wed Feb 26 1997 15:42`	7
	One more question. Would the 4100 system (with Internal Cache enabled) boot from a bootable diskette created on another sysytem? Sam.
3793.3	Suggestion fro TAO BIOS group	PCBUOA::LIBKIND	Sam Libkind - PC Support Engineering 276-9465	`Thu Feb 27 1997 14:16`	14
	The following was suggested from TAO BIOS Engineering: >Hi Sam, > I am sorry to tell you that we cannot find a AMD 486DX4-100SVB > CPU to check out this problem right now. We have only Intel parts and > two AMD DX2-66 in the Lab. > We would like to suggest that J1 jumpper setting on the Colt > MLB be changed. Changing the cache write back/write through (J1) may make > some difference to the AMD DX4-100SVB CPU operation. Please try this suggestion and report the results
3793.4	W1 cured it ok,DEC p/n also ok	SIOG::CORCORAN		`Mon Mar 03 1997 14:15`	6
	Yes,moving jumper W1 to the "on" position cured the problem. As a matter of interest,the Dec part 54-23546-02 (the AMD 100 cpu with the attached regulator) didn't exhibit the problem. Thanks.