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Microsoft’s Altair BASIC interpreter, its later ports, expansions and dialects (like PC BASIC, Commodore BASIC). Use [applesoft-basic] for the Applesoft dialect specifically.

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Did Microsoft BASIC ever use Z80 only instructions?

Did Microsoft BASIC (or any of the OEM versions) ever use Z80 only instructions? For the purposes of this question I'm ignoring the equivalent of BIOS I/O layers which OEMs would have provided.
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