I've never seen a high density Altos diskette. But that doesn't mean there there aren't any; there is a LOT that I've never seen. I've seen a lot of "720K" 5.25" Altos diskettes. Mostly Altos MP/M or CP/M, some Altos Unix, and one Altos diskette that was a CP/M (MP/M) directory structure, but with Motorola (MSB first) byte order. But the source of that diskette couldn't tell me anything more about the machine than "really old" and "ADM 3A". While it COULD be CP/M68K, it was more likely the result of a faulty data conversion program. -- Fred Cisin cisin(a)xenosoft.com XenoSoft http://www.xenosoft.com