These are FD images I could recover. dos211.imd is MSDOS 2.11, adapted to Slicer. Format std 360K IBMPC 40 Trk. This is probably an originally shipped disk. dos211_unpacked.zip contains the unpacked files bios.imd is a Slicer BIOS source code disk. Format std 360K IBMPC 40 Trk This is probably an originally shipped disk. bios_unpacked.zip contains the unpacked files bios37n.imd is an 80Trk 5*1024 disk supposedly containing BIOS 3.7N source. This is probably an originally shipped disk. bios38.imd is an 80Trk 5*1024 disk supposedly containing BIOS 3.8 source This is probably an originally shipped disk. cpm86.imd is a disk probably in CP/M-86 format (40*8*512) containing C source code of some CSE editor. This is likely an application disk. dos80trk.imd is an 80 Trk 5*1024 disk containing MSDOS 2.11. This also contains some unknown programs which might be user code, as well as parts of Microsoft CodeView and C compiler. This is likely an application disk. dos812k.imd is an 80TTrk 5*1024 disk containing some parts of MSDOS 2.11. This is likely an application disk. videosrc.imd contains a86 assembler sources for supposedly the PC extension board (640x200 video board), probably the video BIOS source. This is probably an originally shipped disk.