29 Jul
2004
29 Jul
'04
6:32 a.m.
VAX Architecture Reference Manual requires every VAX
to have one,
and they all indeed do starting with the 11/780. Was the 780
introduced in 1978 or 1979? In any case it was designed in the late
1970s.
The first VAX-11/780 rolled off the prouction line in
October 1977 and the machine was officially announced
in November 1977.
I'd be very surprised if it turned out to be the
first computer with a real-time clock fitted as
standard!
The 1973 pdp-11 processor handbook indicates that
the PDP-11/05 and PDP-11/10 had a line frequency
clock and the PDP-11/35 and PDP-11/40 are
pre-wired to accept a KW11-I. So they could
track the passage of time, but not while the
power was off.
I doubt that any PDP-8 came with any such option
so the only realistic DEC possibility left would be
the PDP-10 range, of which I have no experience.
Antonio
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Antonio Carlini arcarlini(a)iee.org