Regarding MCA documentation, the following might be of use:

Personal System/2 and Personal Computer BIOS Interface Technical Reference,
IBM product code 68X2341 with supplement S86X-2341-00 and
Personal System/2 Model 50 and 60 Technical Reference, IBM product code 68X2224

I'm in Perth, Western Australia and would be happy to loan them to someone
in this region if that helps.

Cheers,
Denis

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