I have software working which will both backup and restore Cromemco disks by reading/writing tracks to/from memory via the RDOS RD/WD commands, and transferring the data to/from the PC with D and SM commands ... it's slow, but it works, and I have successfully backed up and recreated both CDOS and Cromix boot disks in both 5.25" and 8" formats. The only problem is that in order to WD the disk, it has to be formatted. Currently I have to boot CDOS to format the disk - but once I have a blank disk (all it needs is the physical formatting since the file system will be overwritten), I can create either a CDOS or Cromix boot disk via a serial connection. The next step will be to see if we can transfer the CDOS and INIT images code directly to memory and activate it via the serial port - if I can get this working, then you should be able to create a boot disk without having to boot the system into CDOS first. I've just gotten busy with other things.... Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html