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Q: 

Where is programmer's documentation for HP 7974 diagnostic codes?

I'm writing an emulation of the HP 7974 HPIB/GPIB tape drive. The documentation that I have shows that secondary address 31 (0x1F) is used for the self test functions, but I have not found any documentation that describes what those do.

One of the legacy programs I run does some of those functions and I'd like to emulate the functions correctly.

So far, I've been unable to find it on bitsavers.org, one of my favorite places for documentation of this ilk. If I've missed a key document, please let me know.

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