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IBM 5160  -  Motherboard Revisions


There were 2 revisions of the motherboard.

IBM differentiated them by the amount of RAM that it was possible to fit on the motherboard:
   • 64-256KB
   • 256-640KB

Both were not released simultaneously. The 64-256KB motherboard was supplied in early model 5160s, and the 256-640KB motherboard was supplied in later model 5160s.


Example marking Motherboard RAM     Comments
aaa  4 banks of 64 KB  • Detail on the RAM for this motherboard is here.
 • Supplied with the 11/08/82 revision of BIOS.
 • This motherboard is also found in the IBM 5155.
 • A modification is possible so that 640K of RAM can be fitted on the motherboard. See note 1.
aaa 2 banks of 256 KB
and
2 banks of 64 KB
 • Detail on the RAM for this motherboard is here.
 
 • Supplied with either the 01/10/86 or 05/09/86 revision of BIOS.




Note 1 A modification is possible so that 640K of RAM can be fitted on the 64-256KB motherboard.
You will need certain parts, and soldering skill. The procedure can be found here.
Be sure to keep track of what you do, so that if things do not work out, you can undo what you have done.
If you are successful, consider marking the motherboard in some way to remind yourself (and others) that the motherboard has been modified.