Note that 2 of the features added: a) support for subdirectories, and b) replacing File Control Blocks (FCB) with file handles, are the same as for MSX-DOS:
MSX-DOS (1) uses FCBs and a single root directory
MSX-DOS (2) also uses file handles and supports subdirectories
MSX-DOS (both versions) build on a low-level driver which controls the floppy/hard drive. This came in ROM and included higher-level disk handling (file operations, Disk-BASIC etc). The "DOS" part came on a floppy (MSX-DOS.SYS/COMMAND.COM or MSX-DOS2.SYS/COMMAND2.COM).
Yes Microsoft was involved here too. Note that MSX-DOS offered some CP/M compatibility: some programs pulled straight from CP/M (Z80 flavour) could run under it. Some functions deal with CP/M-derived 128-byte "records" (from CP/M floppy formats' sector sizes) rather than byte sizes. But no CP/M disk formats were supported afaik.
Other than that, MSX-DOS2 offered some memory management functions for MSX2's memory mapper. Not sure if equivalent functionality was included in MS-DOS 2?
Comments
Note that 2 of the features added: a) support for subdirectories, and b) replacing File Control Blocks (FCB) with file handles, are the same as for MSX-DOS:
MSX-DOS (both versions) build on a low-level driver which controls the floppy/hard drive. This came in ROM and included higher-level disk handling (file operations, Disk-BASIC etc). The "DOS" part came on a floppy (MSX-DOS.SYS/COMMAND.COM or MSX-DOS2.SYS/COMMAND2.COM).Yes Microsoft was involved here too. Note that MSX-DOS offered some CP/M compatibility: some programs pulled straight from CP/M (Z80 flavour) could run under it. Some functions deal with CP/M-derived 128-byte "records" (from CP/M floppy formats' sector sizes) rather than byte sizes. But no CP/M disk formats were supported afaik.
Other than that, MSX-DOS2 offered some memory management functions for MSX2's memory mapper. Not sure if equivalent functionality was included in MS-DOS 2?