From: John T Kohl (jtkohl@cs.berkeley.edu)
Date: 11/17/91 

Subject: more on 486/33 weirdness
Date: Sat, 16 Nov 1991 23:11:47 PST
From: John T Kohl <jtkohl@cs.berkeley.edu>

Here are more details on my problems with booting in turbo mode:

system config:
        486DX/33, 256K cache, 8MB main memory
        American Megatrends, Inc. BIOS
        real-time clock
        1 3.5" floppy (A:), 1 5.25" floppy (B:)
        1 200MB IDE drive (connor)
                C:, /dev/hd2, /dev/hd3, D: partitions (in that order)
        SVGA: (Orchid ProDesigner IIs/1MB)

I boot off the 3.5" floppy, with root partition on /dev/hd2 and/or /dev/hd3.

sample errors when in "turbo" (33MHz) mode:

<startup stuff>
Partition table Ok.
general protection: 0000
EIP 0008:0000CBB3
EFLAGS 0010206
ESP 0300:0001D210
fs: 0010
base 04000000, limit 000A0000
Pid: 1, process number 1
f3 a5 50 e8 7d fb ff ff 83 c4

... or

general protection: 67b4
EIP 10008:00000004
EFLAGS 00010206
ESP 0020:000067B6
fs: 0010
base 04000000, limit 000A0000
Pid: 1, process number 1
07 20 00 00 27 30 00 00 07 40

sometimes I get two "general protection" errors (same process, usually).

When I toggle the turbo on & off while running, I don't observe any
change in running times of programs (but I can discern differences under
MS-DOS 5.0), even when I run programs which try to time themselves.

Any suggestions?