On 2015-06-12 11:53, Timothe Litt wrote:
On 11-Jun-15 09:17, Johnny Billquist wrote:
DAP is good until 2070 or so. If the DAP implementation on
Tops-10/TOPS-20 don't do things right at the moment, it's just a local
bug within those OSes then. RSX and VMS (maybe others) have had DAP
Y2K secure for many years.
DAP for Phase III/IV (V5.6.0) has 2-digit years. I'm not sure how we
let such a dumb mistake get thru the architecture process, but we did.
T10/20 didn't implement PhaseV, which I haven't looked at. T10/20
development stopped long before Phase V was defined.
Upgrading to Phase V DAP is likely more than "a local bug" fix; it's
real work.
RSX don't have phase V either.
Yes, the year field in DAP is just two digits. But it's not 19xx. It's
actually 1970 - 2069 or some such.
I thought the Tops-10/TOPS-20 stuff was handed over to XKL, but maybe
someone with better knowledge than me can clarify this.
No. XKL had/has a license and could sub-license for use on their
hardware, but DEC retained ownership. I was peripherally involved.
Ok.
The legal jungle around the PDP-11 software is a nightmare. The PDP-10
stuff is easy in comparison, I think.
Easy is alway relative to who has to do the work :-)
Definitely true. But good luck even finding someone who know what you
are talking about if you start contacting HP about the PDP-11 stuff.
Since it was sold off to Mentec, but DEC retained some control rights,
it is really confused. And I doubt anyone is left who was around when it
was worked out. And I wouldn't be surprised if even those people didn't
entirely understand what they created.
Johnny
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