This topic came up on the alt.sys.pdp10 list
https://groups.google.com/g/alt.sys.pdp10/c/ZttQxHZGEJQ
Apparently DECnet-10 won't work past November 9th 2021, which isn't that far
away. Personally I'd never heard this before and had no idea, and since I
know there are a few 36 bit emulations on HECnet that are obviously using
DECnet I thought I'd pass it along.
TOPS20 isn't explicitly mentioned, but I'm guessing that it has the exact
same issue. That'd mean no DECnet on 36 bit systems after next year!
Unless, of course, you want to start playing games with the date (which I
hate doing).
Bob
After sending my last update on 36 bit DECnet, I went back to working a
large ALGOL program from 1980 that I recently scanned. Again, the ALGOL
that ships with PANDA is quite old, dating to 10A145, whereas the most
recent version I picked up from a Tops-10 site on HECnet is 10B310--so
I've been dusting that off.
I remembered that it is not Y2K compliant, so I quick fixed it, in
ALGCON.MAC. at DEC2:, change
DEC2:?? IDIVI A4,^D10???????? ; A4=TENS, A5=ONES
TO:
DEC2:?? CAIG??? A4,^D99???????? ;[T143] After 1999?
???????? JRST?? DEC2A?????????? ;[T143]? Nope, nothing to fix
??????? SUBI??? A4,^D100??????? ;[T143] Reduce by a century
??????? JRST??? DEC2A?????????? ;[T143] Check if in right century
DEC2A:? REMARK????????????????? ;[T143] Here when year is in range
??????? IDIVI?? A4,^D10???????? ; A4=TENS, A5=ONES
Simple enough.? And then something in the back of my mind started
recalling a comment that such fixes wouldn't work after 2052.? A dim
memory surfaced about my first DECtape in 1975 (it was a birthday
present) that I had to have updated because of something called 'DATE75'.
So I went spelunking and here is what DATE75 is all about. Briefly,
/very/ early versions of Tops-10 could only handle dates between January
1^st 1964 and January 4^th 1975.?? 3 additional bits were found in the
directory and other formats that brought the end date out to February
1^st 2052--a fine hack.
Anyway, a number of things broke in 1975 when the first bit started
getting used, which is why apparently somebody had to play with my
DECtape.? Bugs were also found (times being off by 11 years and four
days) in January 8^th 1986 when the 2^nd bit started being used.
It may very well be that, despite my kludge to prevent Tops-10 from
crashing in November of next year, it may drop dead before the NICE
field is expired in 2052.
I think it might depend on what overflows in the result of the DATE
UUO.? Unfortunately, its format deeply confused me in High School, but
maybe I'll have another look after all these year.
Happy 2021 to everyone in HECnet land.
I hope that it is an eventful and fruitful year for all and that it isn?t as bad as the year we are leaving behind.
Cheers, Wiz!!
Sent from my iPhone
Why? Because I felt like it and it wasn't too hard.
I have a PyDECnet version that can handle not just IPv4 but also IPv6. It's on node PYTHON right now and on the map server 28NH (at akdesign.dyndns.org). This applies both to the web interface and also to the various IP-based datalink protocols. I've tested Multinet, GRE, Ethernet (UDP bridge) and DDCMP.
If anyone is interested in using this with PYTHON, let me know.
Unfortunately dyndns.org doesn't support IPv6 records well; I can enter one manually but it disappears after a while for reasons I do not understand. It's there now. You can access the mapper's web page (akdesign.dyndns.org:8080) that way if you like.
paul
I'm embarrassed that I don't remember this, but somebody had a way to
generate a HECnet node name and address list in a format compatible with
pyDECnet. How did that work again?
Thanks,
Bob
Hi
It appears once upon a time there was some sort of a VMS-like shell on
DOS called PCVMS from Wendin Software. Sampsa asked for it from the last
person to work on it 11 years ago at
http://personallyinteresting.blogspot.com/2009/04/computer-archeology.html
Wondering if Sampsa or anyone has floppy images.
Thanks.
--
Supratim Sanyal, W1XMT
39.19151 N, 77.23432 W
QCOCAL::SANYAL via HECnet
Do VMS cluster group numbers need to be coordinated on HECnet? If so, is anybody taking care of the coordination yet? I'm getting ready to set up a VAX cluster in my little patch of area 2.
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
https://www.nf6x.net/
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