Motherboard BIOS configuration of the IBM 5162 is referred to by IBM as SETUP. Some people refer to it as CMOS SETUP.
Some reasons for running the SETUP procedure are:
• You have changed an option in the 5162 (e.g. add/remove RAM, change video card type, ...)
• You have replaced a dead/low battery
• Somehow, the SETUP has become corrupted, and you need to correct that
The IBM way of running the SETUP procedure is to boot the 5162 from the 'Diagnostics for IBM AT and IBM XT Model 286' floppy, however other methods are available.
The following assumes that your IBM 5162 is fitted with IBM 5162 BIOS ROMs, i.e. not swapped out for non-IBM ones.
If non-IBM BIOS ROMs are fitted in your 5162, the following may not work (it depends on the particular BIOS).
METHOD 1 - THE IBM WAY: USING THE DIAGNOSTICS FLOPPY
This method requires that you have the 'Diagnostics for IBM AT and IBM XT Model 286' 5.25" floppy.
A procedure for using that floppy to perform SETUP is at here. The procedure pointed to is actually for the IBM 5170, but the 5162 procedure is similar enough that you will adjust.
In fact, the IBM 5162 and IBM 5170 are so close, that you can use the 'Diagnostics for the IBM Personal Computer AT' floppy intended for the 8 Mhz version of the IBM 5170. All that you will lose is the ability to set the hard drive type to type 24.
METHOD 2 - TYPING CODE INTO BASIC
With this method, you do not need a floppy.
The 5162 will be allowed to boot into BASIC, and then you'll type in some BASIC commands.