System V Release 4.0

[Charles Hedrick]

>a vanilla SVR3. If your SVR3 had real job control support (not the
>shl stuff), it wasn't plain SVR3.

That or somebody had put up a ksh with my patches in it.  ksh-i does
have code to provide job control based on sxt's.  With a few fixups it
works fairly well.  Most users wouldn't be able to see any difference
between it and Berkeley job control, though there are.