I once got a "TU58i" Monitor-program in an
EPROM that replaces the
original firmware of a TU58, and then should provide the ability to
(re)format a TU58 or DC100 cartridge in a normal TU58 drive. Anybody
ever heard of this?
Conventional wisdom holds that it's not possible to format TU58
cartridges, but I've long suspected that DEC must have had alternate
firmware for in-house use for this purpose.