[comp.sys.ibm.pc.hardware] Writing a BIOS. Help needed!

cyang%peruvian.utah.edu@cs.utah.edu (Cheng Yang) (06/08/91)

Hello, everybody!

While I am exploring my IBM PC/AT clone, I decide to revise its
BIOS (just for fun).  My machine has an AMI BIOS dated 1989.
Does anyone here know where to find any reference of writing
a BIOS for an AT or 386 machine?  What's the major difference
between a 286 BIOS, 386SX BIOS and 386DX BIOS?  Are they essentially
the same?

I would appreciate if anyone could give me some idea where to find a
good reference book for writing a BIOS.


Thanks a lot for your time in advance.

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