I have done some data forensics on weak disks. If you happen to have the unaltered, original file (or a dump of the IBM character set) please post it!
Most important is the lost Code Blue (IBM emulator) update
- required for DOS 3.10b. Now comes with documentation, hints, and a key map -1) https://dl.dropboxusercontent.com/u/37819653/BANNISTER/CODEBLUE_3.x_UPDATE_rev.20160804.7z
Note: CB3.EXE floating around has all mandatory and optional patches applied ('Yes' everywhere, 'fast' key repeat, IBM character ROM installed). My patch is better / more flexible This update expects version 2.0 of CB.EXE (from 1987)...
IFormat & IDrive (with IFORMAT3, which had a harmless bad spot around offset $229D
):2) https://dl.dropboxusercontent.com/u/37819653/BANNISTER/IFORMAT_RECOVERED.7z3) the fast, free Norton Commander clone written in assembly (Soeren Kragh, 1992)
i used in the screenshot above. (last download contains an untampered archive. Must be invoked via CodeBlue /V on the Rainbow, as it was written for PCs)