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Bios Password

By crowngreen ·
I have been given an old 486dx4 pc but someone has put a password on the bios setup.Dont know the password
Dont know what the m board is or if there is a jumper that will reset bios. I have removed the battery for a few hours to no effect How can Iaccess the bios setup and remove the password request
Also the cd rom which is a 4 disc rom recognises cd's but will not read them. also when trying to load win 98 after f disk and format message appears saying win 98 requires a processor 66mhz andabove processor is 100mhz amd

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Bios Password

by dmiles In reply to Bios Password

The work around you have tried will not work by installing another CPU,the bios is not updated to recognize the cpu

The Bios password has to be changed using a jumper or switch on the motherboard,which requires locating the motherboard model number and researching the internet for that particular board.

The bios is not updated so that it can recognize the cpu, just by installing it on motherboard,the 4x cd-rom speed is not reading the cd because it's speed is not compatible,it will take longer to read cd

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Bios Password

by crowngreen In reply to Bios Password

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Bios Password

by CG IT In reply to Bios Password

You can try to locate a manual for your motherboard on motherboards.org. You'll need to find the serial # on the board. Old 486's are jumper boards and the 100mhz processor will run at the default speed set by jumpers on the board [again you'll needthe manual]. Some 486 boards will only handle [regardless of jumpers]33mhz,66mhz processors. Back then, most BIOS's on those old boards weren't flashable. You had to take out the old BIOS and put in a new one [provided the connectors weren't permanently soldered in]. Since this is a 486 and you've loaded DOS, how is your config.sys setup? the UMB Device=[the device like a CD rom] config.sys command line syntax will loads drivers into upper memory to conserve conventional memory [memory below 1 MB, {really 640K}. If not configured right, you won't have enough free conventional memory to run your programs.

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Bios Password

by crowngreen In reply to Bios Password

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Bios Password

by TheChas In reply to Bios Password

The answers you have been given are correct.

Unless you can identify the make and model of the motherboard, it will just be good guessing as to how to set the jumpers.

Good resources to identify motherboards include:
www.motherboards.org
www.wimsbios.com

However, if this was an OEM motherboard, you need to identify the original PC it was in in order to find a manual.

Next, I stronly advise against running Windows 98 on a system so close to the minimums.
You will actually get significantly better performance if you install Windows 95 instead.

My rule of thumb, is to not install an OS unless the system has 2X the minimum required resources.

In fact, I don't install W98 on systems with less than a PII 350MHz CPU.
A Pentium 233MHz MMX system runs a good 10% slower with W98 installed as compared to W95.

Chas

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Bios Password

by crowngreen In reply to Bios Password

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Bios Password

by joe In reply to Bios Password

If you don't like the answers above than throw that PC in the garbage.

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Bios Password

by crowngreen In reply to Bios Password

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Bios Password

by TheChas In reply to Bios Password

You are at your own risk for the following websites and linked utilities.

They may work, or they may damage the BIOS.

http://www.simtel.net/pub/pd/12073.html

http://www.dewassoc.com/support/bios/bios_password.htm

Remove any spaces from the pasted links.

I do recall a few motherboards that required a setup floppy to perform some system setup tasks.

Still, I would be surprissed if the motherboard has the CPU speed settings in BIOS.
I believe that the first time I saw that was on PII's, and Athlon CPUs.

For a DX4 100 CPU, you set the clock to 25MHz, and the chip itself takes care of the 4X multiplier.

Note: Many 486 motherboards were built to only use a specific speed CPU.

As stated previously, you are best off trying to determine that make and model of this motherboard, and getting a manual for it.

Alternately, you can find running Pentium systems for under $50 at many web sites.

Chas

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by crowngreen In reply to Bios Password

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