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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

Removing the IBM Fixed Disk and Diskette Drive Adapter and substituting a third-party floppy controller can result in a 601 error during POST (Power On Self Test).
There is something in the IBM BIOS that expects the IBM Fixed Disk and Diskette Drive Adapter (or compatible card).
Substituting the IBM BIOS with a third-party one, is a known workaround.