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Ruud's diagnostic ROM
fitted to IBM 5170 (IBM AT), and AT clones


Presently, there is no AT version of Ruud's diagnostic ROM.

If you try to run the XT version of Ruud's diagnostic ROM on an AT-class motherboard, it is expected that certain tests will fail.

The post at here shows me attempting it in 2023.

The test failures are because of hardware differences between a PC/XT-class motherboard and an AT-class motherboard.