23 Jul
2008
23 Jul
'08
4:24 p.m.
A post about a multiprocessor PDP-11/45 made me think about a
multiprocessor microPDP-11/83. Is it possible to connect the Qbus of two
microPDP-11/83s together? what about Unibus PDP-11/84s? The -11/83 is
more interesting, because I can replicate it.
Since bus arbitration is handled by the processor, arbitration on one of
the processors would need to be disabled. The KDJ11-B Users Guide
doesn't suggest a way to do this. The arbitrating processor would also
have to field all the interrupts.
I am tired of reading about the first computer on the internet...
Besides, I have not heard any of you wise guys argue that there couldn't
be a first computer on the internet (or Internet) or any network since a
single computer can't make up a network.
-chuck
23 Jul
23 Jul
4:35 p.m.
Charles H Dickman wrote:
Is it possible to connect the Qbus of two
microPDP-11/83s together? what about Unibus PDP-11/84s?
Neither one without a lot of hardware hacking.
Since bus arbitration is handled by the processor,
arbitration on one of
the processors would need to be disabled. The KDJ11-B Users Guide
doesn't suggest a way to do this.
AFAIK, there's no feature to do that designed into it.
IIRC, the MicroVAX II CPU module (KA630) was designed to do exactly what
you describe.
I am tired of reading about the first computer on the
internet...
I haven't seen any discussion of that here, and it's not controversial.
Besides, I have not heard any of you wise guys argue
that there couldn't
be a first computer on the internet (or Internet) or any network since a
single computer can't make up a network.
Well, one of them had to be the first to send a packet, and I think you
can argue that you are connected to the internet until you actually send
or receive a packet. The node receiving that first packet would then be
the second node on the internet, since it started receiving the packet
at a later time than the first node started sending it (due to
propogation delay).
Eric
8:10 p.m.
A post about a multiprocessor PDP-11/45 made me think
about a
multiprocessor microPDP-11/83. Is it possible to connect the Qbus of two
microPDP-11/83s together? what about Unibus PDP-11/84s? The -11/83 is
more interesting, because I can replicate it.
How about a T-11 (Falcon)? They were designed to be slave processors in
a multiprocessor system.
De
8:34 p.m.
On Wednesday 23 July 2008, Dennis Boone wrote:
Sure, a KXT11 (M8377), or KXJ11 (M7616) slave processor board would
probably fit the bill here.
I have a KXJ11 or two thanks to another cctalk member, which I mean to
get back to playing with at some point.
Pat
--
Purdue University Research Computing --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
A post about a
multiprocessor PDP-11/45 made me think about a
multiprocessor microPDP-11/83. Is it possible to connect the Qbus
of two microPDP-11/83s together? what about Unibus PDP-11/84s? The
-11/83 is more interesting, because I can replicate it.
How about a T-11 (Falcon)? They were designed to be slave processors
in a multiprocessor system.
5995
days inactive
5996
days old
4 comments
4 participants
participants (4)
-
chd_1＠nktelco.net -
drb＠msu.edu -
eric＠brouhaha.com -
pat＠computer-refuge.org