Did you set the jumpers at the dx4-100 settings?

Also... did you clear the CMOS to clear the BIOS settings?

Sounds like you tightened up the timings too much and didn't set them back to default to me.

Actually, now that I recall. It was benchmarking fine in DOS 2.66 using Philscomputerlab benchmark tools.
So I think I will put the AMD 5x86 back in and confirm a stable build.
Then I will reinstall Win95c because I think the original install has become corrupt and was causing the lockup.

I looked for a Clear CMOS jumper but did not find one.
I checked the manual but did not see any listing of one.
So I just removed the battery and reinstalled.

Lock up when accessing peripherals can also be caused by too-high ISA bus speed.
Try AT bus clock CLK/4 when testing whether the hardware has gone bad.

Okay, I am back up and running with AMD 5x86 CPU.
Benchmarking and regression testing now to confirm best bios settings for a stable build.
So far so good.

If you have set the jumpers for an AMD cpu it will not work correctly with an intel dx4.....

retardware wrote:

Lock up when accessing peripherals can also be caused by too-high ISA bus speed.
Try AT bus clock CLK/4 when testing whether the hardware has gone bad.

He has clocked the FSB at 40 MHz, so even CLK/4 is too much.
ISA Bus clock should be at 8 or 8.33 MHz.

Your 40/3 = 13.33 MHz has been very risky.

CLK/6 @ 50 MHz FSB
CLK/5 @ 40 MHz FSB
CLK/4 @ 33 MHz FSB
CLK/3 @ 25 MHz FSB
CLK/2.5 or CLK/3 @ 20 MHz FSB
CLK/2 @ 16 MHz FSB
Anything else overclocks the EISA or ISA bus.

Disruptor wrote:

He has clocked the FSB at 40 MHz, so even CLK/4 is too much. ISA Bus clock should be at 8 or 8.33 MHz. […]
Show full quote

retardware wrote:

Lock up when accessing peripherals can also be caused by too-high ISA bus speed.
Try AT bus clock CLK/4 when testing whether the hardware has gone bad.

He has clocked the FSB at 40 MHz, so even CLK/4 is too much.
ISA Bus clock should be at 8 or 8.33 MHz.

Your 40/3 = 13.33 MHz has been very risky.

CLK/6 @ 50 MHz FSB
CLK/5 @ 40 MHz FSB
CLK/4 @ 33 MHz FSB
CLK/3 @ 25 MHz FSB
CLK/2.5 or CLK/3 @ 20 MHz FSB
CLK/2 @ 16 MHz FSB
Anything else overclocks the EISA or ISA bus.

So what “Clk” setting and timing do you recommend for a AMD 5x86-133-P75 overclocked to 160mhz. ?
Core v3.3
I have it set at 4x40mhz. = 160mhz.

So is a Clk/5 @ 40 MHz FSB with timing of 2-1-1-1
Is this okay ?

CLK/5 is correct at 40 MHz FSB.
2-1-1-1 may work, but it is tight. You may have luck. Perhaps you need 1 write wait state. Be patient and don't draw conclusions too early.
Please report.

You can save the pictures from SST478 as pcx.
You can convert them to png and place them here.