The Max-80 was a computer made by Lobo Drives, similar to the TRS-80 Model III but not fully compatible, and with some Model 4-ish extensions. A version of LDOS 5 was available for the Max-80. The operating system is compatible with Model III programs, but the disk will not boot on a Model III due to the differences in hardware drivers required to support the Max-80. The Max-80 LDOS 5.1.3 image included here is 80 track, double sided, double density. The .dsk file will not boot on any known emulator, but it can be read as a data disk under LDOS or LS-DOS on an emulated Model I, III, or 4. It should be possible to copy the image back to a real floppy using such an emulator and boot the real floppy on a real Max-80. I don't know what the last version of LDOS issued for the Max-80 was. It's quite possible that something newer than 5.1.3 was released; if so, I'd appreciate a copy. Thanks to Robert L. Squires Jr. for supplying a copy of 5.1.3. There was also an LS-DOS 6 compatible operating system for the Max-80, but I don't have a lot of information about it. Rich Deglin demo'ed it on his Max-80 for me a few years ago. If I recall correctly, Rich said that Misosys wasn't interested in porting LS-DOS 6 to the Max-80, so he and another programmer took on the effort. I think the system was called MaxDOS. For some unaccountable reason I didn't have Rich give me a copy. --Tim Mann