On 2016-03-12 20:36, Bill Cunningham wrote:
What I meant was that I remember on early PCs using an rs232-c line for
using the old BBSes and compuserve before it was an ISP. 10 cents a
minute. I had several modems 300, 1200 and 2400 baud modems.
Oh, certainly. RS-232 connections were used for that a lot too.
These even older machines may have had hookups within a company.
Even one building connecting 5 or so machines. Serial would've worked
fine. And was what was used. I was thinking with maybe 4-5 PDP8s a
company would use some kind of networking. Perhaps not back then. I was
only aware of pdp11 and vax being "network possible". I guess I was wrong.
Well, if we talk networking as in using some protocol to communicate
between machines, there have been plenty of different technologies.
RS-232 is one obvious one. There have also been others. The point is,
networking itself is a software thing. You need some kind of connection
between the machines, which can carry bits. But everything beyond that
is software.
Johnny
Bill
----- Original Message -----
*From:* Clem Cole <mailto:[email protected]>
*To:* Anders Magnusson <mailto:[email protected]>
*Cc:* SIMH <mailto:[email protected]> ; Bob Supnik
<mailto:[email protected]>
*Sent:* Saturday, March 12, 2016 2:24 PM
*Subject:* Re: [Simh] [SimH] Networking support
On Sat, Mar 12, 2016 at 12:25 PM, Anders Magnusson
<[email protected] <mailto:[email protected]>> wrote:
DG-UX or MV/UX?
Which was the rewrite of System V ?? i.e. System V cmd system, but
internally developed System V SMP kernel -- I want to say DG-UX
maybe; but I'd been a long time and many beers ago - I've forgotten
the name. I remember it was a very clean UNIX implementation.
Nice locking structure, easy to debug, etc...
Locus was working on different projects with Ultrix, Tru64, VMS,
AIX, SunOS, Solaris, HP-UX, Apollo, DG's UX, some work for Pr1me,
ISC's 386/ix, Intel's 386 port, SVR4 for the AT&T/UI guys, and
Intel's Paragon at the same time. At one point, I had the OS
release schedules for HP, DEC and Sun all pasted on the wall behind
my desk. I used to say LCC got to see everyone's dirty laundry in
those days. As I said, I do remember the DG Unix re-implementation
was very easy to work on (I will not say which one we cursed the most).
The DG ethernet card has a 82586 on board.
As I said, many beers ago. I'm undoubtedly mixed up a couple of the
systems, since we had so many we worked with in those days. I
remember the AMD chip was a lot easier to program than the Intel
device. That said, I suspect that I have the docs on the Intel chips
somewhere, but it sounds like others have the DG docs which are
going to be better for simh purposes.
Clem
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--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: [email protected] || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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