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Ruud's Diagnostic ROM

Click here for the IBM 5150 motherboard of type 16KB-64KB.
Click here for the IBM 5150 motherboard of type 64KB-256KB.

Click here for the IBM 5155 motherboard       <-----  IBM 5155 contains an early IBM 5160 motherboard

Click here for the IBM 5160 motherboard of type 64-256KB.
Click here for the IBM 5160 motherboard of type 256-640KB.