> > For both the DEC RX01 and the DEC RX02 8" floppy drives, > while it might have been possible that DEC engineers were unable > to initially figure out how to allow users to perform an LLF (Low > Level Format) on the 8" floppy drives, it seems certain that after > 3rd party manufactures figured out, DEC could also have supported > that function as well.
The controller microcode ROMs in both the RX01 and RX02 are tightly packed, there is not enough room (IMHO) for a LLF routine. And to use larger ROMs (certainly in the RX01) would mean some other electronic modifications. [...] > After I managed to locate a DSD (Data Systems Design) > drive which supported the DEC RX02 floppy drive function, The RX02 can reformat an RX01 as double-density. An RX01 is essentially IBM3740 format. I have no problems formatting a blank disk as SSSD in a CP/M machine and then using a (real DEC) RX02 drive to turn it into a DEC double density disk. [...] > Note that the RX50 was the same. DEC finally changed Not really. The RX01 and RX02 have the controller electronics in the drive chassis, and that determines what the drive unit can do (like not doing an LLF). The RX50 is just a bare drive, the interface is much the same as a PC (say) floppy drive interface. An RX50 drive, given the right pulses on the write data line, will most certainly do an LLF. Some DEC controllers used with it, and some software that used said controllers might have been unable to do an LLF, but that's not a problem with the drive. -tony
