Luis Claudio Grosso has made a disassembled and well documented source of MSX DOS 1.03. He took the MSXDOS.SYS file and created a source file that can be assembled.
With the sources made by Arjen Zeilemaker of many system roms. like MSX 2, various diskroms, audio and the MSX BIOS book and other sources on my website not much is hidden how the MSX system software does its work.
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