In the Phase IV network management spec the description of the encoding of the event log message has this field:
JULIAN HALF DAY (2) : B Number of half days
since 1 Jan 1977 and
before 9 Nov 2021
(0-32767). For
example, the morning
of Jan 1, 1977 is 0.
It's a 16 bit field containing a 15 bit value; there is no explanation why the upper bit is not used even though it's marked as an unsigned integer.
As shown, the field overflows in late 2021. If one ignores the arbitrary limit of 15 bits, the end date is 18 September 2066, which is more civilized.
I wonder if implementations ignore the 15 bit limit. I think RSTS/E ignores it.
paul
I'm searching for an RQDX2 controller. I know this is maybe a bit off
from normal HECnet discussions, but I'm hoping that maybe some people
might happen to have some real hardware.
I have a few RD53 drives I'd like to read out the contents of, and it
seems they were controlled by an RQDX1 or RQDX2. I have an RQDX3
controller, however, the on disk format differs between the RQDX1/2 and
the RQDX3, so I don't have any ability to read the drives right now.
Since I am in Switzerland (near Zurich) someone local would be much
easier, but if someone somewhere else have a card, is willing to ship
it, and don't expect a bunch of money in return, I'm interested in that
too. If nothing pops up, and can solve this myself at Christmas, when I
go back to Sweden, where I have access to more hardware. But being an
impatient guy, I'm trying this option as well... :-)
Also, an RQDX1 should also work, but if possible, I prefer the RQDX2,
since the RQDX1 have some additional issues...
And of course, if I manage to get the data out from the drives, there
might be some useful things on there that I can share in the end (I'm
specifically searching for a few files needed to complete a Modula-2
compiler that exists for RSX).
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
