Voltage Selection for System ROM

  • Thread starter Thread starter emc
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emc

I'm in the process of putting together a P3 cpu with a 440BX chipset MB. The
manual gives an option for a the System ROM (Flash EPROM), 5V or 12V. Which
setting should be selected? The manual does not suggest either one.

Any thoughts on the matter would certainly be appreciated.

ed.
 
emc said:
I'm in the process of putting together a P3 cpu with a 440BX chipset MB. The
manual gives an option for a the System ROM (Flash EPROM), 5V or 12V. Which
setting should be selected? The manual does not suggest either one.

Any thoughts on the matter would certainly be appreciated.

ed.
Click to expand...
Almost impossible to tell. The choice depends on which physical type of
chip was installed on the motherboard. There seems a good chance that,
if the system is starting far enough for you to get to the BIOS setup
screens, the voltage is probably set correctly.
 
emc said:
I'm in the process of putting together a P3 cpu with a 440BX chipset MB. The
manual gives an option for a the System ROM (Flash EPROM), 5V or 12V. Which
setting should be selected? The manual does not suggest either one.

Any thoughts on the matter would certainly be appreciated.

ed.
Click to expand...

It depends upon the part number used for the bios chip. I believe that
a chip with a prefix of 28 is a 12 volt chip, while a chip with a 29
prefix is a 5 volt one. I AM NOT SURE, CHECK FIRST. Do a search for
the part number used on your MB and you should be able to determine what
the (write enable?) voltage for your chip should be.
 
emc said:
I'm in the process of putting together a P3 cpu with a 440BX chipset MB.
The manual gives an option for a the System ROM (Flash EPROM), 5V or 12V.
Which setting should be selected? The manual does not suggest either one.
Click to expand...

Why not try it with the lower setting and if it doesn't work, then up it to
the higher setting. 5v won't damage a 12v chip, it just won't work, but 12v
would probably damage a 5v chip!
 
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