Philips :YES
Officially the last computer in the P2000-line, featuring a 80186 processor at 8MHz.
I am still looking for a set of version 1.04 BIOS ROMs! If you happen to use this version, please dump it and let me know and/or share it with TheRetroWeb project!
I'm also looking for a working MS-DOS 2.11 boot disk.

MS-DOS 3.10
Thanks to Mels over at RetroMelsArchive.com, we now have a working MS-DOS 3.10 boot disk for the Philips :YES!
You can download a copy of it here:
Philips YES MS-DOS 3.10 English.img

DOS Plus 1.1
The Home Computer Museum
has a disk image in their archives labled 'YESMSDOS.TD0'. However this is a TeleDisk image of Digital Research's
DOS Plus 1.1, and an Italian version too.
I've converted the image (using this script) to a more common (.img) raw sector format that you can download here:
Philips YES DOS Plus 1.1 Italian.img

MS-DOS 2.11
I found a 5.25" 720KB disk that holds an incomplete/damaged MS-DOS 2.11 disk.
IO.SYS and MSDOS.SYS are missing (were never on the drive judging by the sector data; I suspect someone copied the files on it from another drive, but that skips the system/hidden files by default).
Also a bunch of sectors are damaged. 1359 out of 1440 recovered (10 revs/track; tried 30 revs on damaged tracks with no result).
Images here:
Philips YES MS-DOS 2.11 English (damaged).img
Philips YES MS-DOS 2.11 English (flux).scp (captured by GreaseWeazle 4.1)