Re: [Simh] pdp11 fails MAINDEC CPU test 14 D0NA
-- Re: [Simh] pdp11 fails MAINDEC CPU test 14 D0NA From: Johnny Billquist b...@softjar.se Date: Jul 9, 7:29 PM To: Paul Koning paulkon...@comcast.net CC: Paul Moore paulmoore...@hotmail.com, simh@trailing-edge.com On 2020-07-10 02:19, Paul Koning wrote: The VAX architecture seems to have been an explicit design effort. For the Alpha this was even more obvious, where a monstrously large book (certainly 500 pages, maybe double that) was written and reviewed in depth before anything was cast into silicon. Not so for the PDP11, as you pointed out. It definitely was an explicit effort. I seem to remember seeing/reading somewhere at some point that this was because of what had happened on the PDP-11. So a lesson learned kind of thing. The VAX architecture was indeed an explicit effort, but more than that, it was developed in conjunction with VMS. The hardware was developed to run the OS that was written to run the hardware. I know because my Dad told me some stories of when he was on the VAX-B design team, having been on the RSX-11M project, so he came with Cutler's say so, I presume. In typical Ken Olson fashion, there were two teams set up to "fight" with each other. The VAX-B team would review everything the VAX-A team did, kick the tires, find flaws, and suggest additions or improvements. Everything was hashed out on paper before anything materialized. I'm not clear on where Gordon Bell fit into the process. He may have handed commandments down like Moses and everyone implemented them. I used to have an Alpha Architecture manual, but I lost it somewhere along the way. :-( I do. Somewhere. Hmmm. Phil Mendelsohn "Behind the times, but ahead of the game." --Becky Mendelsohn ___ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh
Re: [Simh] BLISS ( was Re: 101 Basic Games for RSTS/E (was Re: PDP11 on Simh for public access))
Subject Re: [Simh] BLISS ( was Re: 101 Basic Games for RSTS/E (was Re:
PDP11
on Simh for public access))
FromJ. David Bryan
To SIMH List
DateSun 15:24
On Sunday, January 28, 2018 at 15:42, Timothe Litt wrote:
Was it admiral Nelson who observed that those who don't learn from
history are doomed to repeat it?
George Santayana ("Those who cannot remember the past are condemned to
repeat it").
As this is one of those epigrams that has probably had multiple
independent authors over millenia, I prefer:
"He who forgets the pasta is doomed to reheat it."
Cheers,
Phil M
P.S.: the subject of this thread is growing enough parenthesis to start
being confused with Lisp.
--
"Behind the times but ahead of the game"
--Becky M
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Re: [Simh] VAX DZ terminal controller unit?
On 11-05-20 01:11 PM, Gary Lee Phillips wrote: The original hardware connected to serial lines, and no doubt understood DTR, RTS, DSR, etc. So if you really disconnected your terminal, by dropping the DTR, the interface should have cleared immediately. Since the emulation is using a TCP link, it may not translate the disconnect into a signal that the VMS system recognizes as a disconnect, hence we get the timeout period instead. This smells like the right area to be poking around in, but I seem to recall an awful lot of VTs that were wired just TX, RX, and ground and they just worked. The handshaking lines were never sufficient and often not even necessary to make things play nice, IIRC. Don't know what the emulation thinks it's doing or what it's actually doing, but I feel like you might be able to disable DTR etc. Sorry I'm rusty, HTH. ___ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh
