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From: Kelvin Sherlock <email@domain.com>
Newsgroups: comp.sys.apple2.programmer
Subject: Microsoft BASIC for 6502 Microprocessor
Date: Wed, 3 Sep 2025 18:41:15 -0400
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... is now available under an MIT license.


https://opensource.microsoft.com/blog/2025/09/03/microsoft-open-source-historic-6502-basic/ 


https://github.com/microsoft/BASIC-M6502

It was written with an oddball cross-assembler so you're probably 
better off with a commented disassembly of AppleSoft if that's what you 
want.