On Fri, 23 Jan 1998, Barry Peterson wrote: There are probably enough exceptions to make a liar out of anyone. However, in general the machines are related like this: Kaypro II - first of the volume produced Kaypros. Came in a couple of versions as defined by the Boot EPROM. The 81-149-C was the early version, followed by the 81-232. These units had SSDD full height drives stacked vertically. Early models had a fixed power cord, later versions had the plugin variety. These machines were the predecessor of the Kaypro 4. They are considered as '83 machines. Kaypro 2 - this was a later ('84) version of the Kaypro, which usually featured half height drives stacked vertically. Front panel sheet metal appeared between the drives. Again, the drives were normally SSDD. The boot EPROM was the 81-292. They shared a common motherboard with the Kaypro 4. Kaypro 2X - this was really a 4 in sheep's clothing. They usually carried EPROM 81-292 and shared a motherboard with the late Kaypro 4s. Drives were half height DSDD stacked vertically like the Kaypro 2. Some Kaypro 2X's had the built in real time clock and modem. Others had one or none! Some carried the dreaded 81-478 U-ROM which was Kaypro's approach to one that would cover any and all of their 8-bit requirements. I have probably missed a couple of details, but that is the general thrust of things. - don donm(a)cts.com *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives Chairman, Dina-SIG of the San Diego Computer Society Clinging tenaciously to the trailing edge of technology. Sysop - Elephant's Graveyard (CP/M) - 619-454-8412 *--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--* see old system support at http://www.psyber.com/~tcj