IBM 5150 Hardware Reference Manual
of
393
April 2011
IMPORTANT
1. The motherboard described in this document is the
first motherboard, the 16KB-64KB one.
2. If the BIOS on the 16KB-64KB motherboard has
been upgraded to the third revision one, then the
switch settings shown for SW2 (“switch 2”) on the
motherboard no longer apply.
The BIOS revision can be determined by examination
of the seven digit number on motherboard chip U33.
First revision: 5700051
Second revision: 5700671
Third revision: 1501476