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IBM 5162  -  BIOS Revisions


On the 5162 motherboard, there are two BIOS ROM chips, one in socket U34 and the other in socket U35.

They are two 8-bit chips which, in combination, supply 16 bits to the IBM 5162's 16-bit data bus.  Of the pair, U34 is the EVEN/LOW chip and U35 is the ODD/HIGH chip.  Diagram here.

There was only one revision of the BIOS, identified by the date of 04/21/86 (there is no version number).

The date format used is MM/DD/YY.


  Part numbers, where BIOS supplied
in masked ROM form
Part numbers, where BIOS supplied
in EPROM form
Floppy/diskette
drive support
Hard drive support
04/21/86 ? U34=78X7460, U35=78X7461   (photo) 360K, 1.2M, 720K, 1.44M Click here


Click here for content images (can be used to create replacements).




Known problem - POST error of 601

The IBM 5162's motherboard BIOS is very close that of the 1986 dated IBM 5170's, and shares the situation where the POST can sometimes produce a 601 error if the IBM Fixed Disk and Diskette Drive Adapter is substituted.  More information on that is in the 'Known problem - POST error of 601' section at here.



Modified 04/21/86 BIOS

There is a modified 04/21/86 BIOS available in the VCFF thread at here.
Details of what was changed are in the thread.