Unix History

[Scott R. Anderson]

In article <6780 at utzoo.UUCP> henry at utzoo.UUCP (Henry Spencer) writes:
>> Could anyone give me a short run down on lineage
>> of the major lines of UNIX? Perhaps a brief narration 
>> or a family tree showing how sys V and 4.3 and such 
>> are all related...
>
>Between V6 and V7, draw a branch starting out "PWB" and
>proceeding on through "SysIII" and "SysV" to "SysV.3.2.4.etc".

This raises the burning question:  whatever happened to
Systems I and II, and, especially, IV?  I never hear them
discussed.  Were they ever released commercially, and if
not, why not?
-- 

					Scott Anderson
					ihnp4!oddjob!kaos!sra