[ih] byte order, was Octal vs Hex, not Re: Dotted decimal notation

John Day jeanjour at comcast.net
Wed Dec 30 20:10:53 PST 2020


We had an Imlac connected to our PDP-11 running TNLS over the ARPANET.

I remember spacewar on the Imlac but not mazewar.

> On Dec 30, 2020, at 23:00, Jack Haverty via Internet-history <internet-history at elists.isoc.org> wrote:
> 
> Hi Geoff,
> 
> I was in MIT-DM when Mazewars happened, and I did some surgery on our
> PDP-10 TTY hardware to boost the RS232 speed up near 100 kb/s so we
> could make the game reasonable with Imlacs interacting with MIT-DM over
> RS232.   It became quite popular.
> 
> But I don't recall any cross-country Mazewars at all over the ARPANET.  
> At one point, I did contact BBN to ask if TIP lines could be run at
> higher speeds (like at least 56 kb/s), so we could plug Imlacs in to
> TIPs.   The answer was "The TIP supports speeds up to the reasonable
> maximum of 9.6 kbps."   I suppose someone could have tried running
> across the ARPANET somehow through a Telnet connection, but I don't
> remember anyone doing that.
> 
> FYI, the 1970s-era ITS and Imlac Maze have both been resurrected by a
> group called "ITS Hackers".   I don't know how far they've gotten but it
> may someday be possible to run Maze over the Internet.
> 
> See https://github.com/PDP-10/its/issues/1330
> 
> /Jack Haverty
> 
> 
> 
> On 12/30/20 6:50 PM, the keyboard of geoff goodfellow via
> Internet-history wrote:
>> in a trip down memory lane vis-a-vis "The Imlac PDS-1" at
>> https://en.wikipedia.org/wiki/Imlac_PDS-1
>> yours truly chances to note at the bottom under Applications
>> 
>> "... *Mazewar <https://en.wikipedia.org/wiki/Maze_War>*, the first online
>> multiplayer computer game, was created on a pair of PDS-1's. Later, up to 8
>> players ran on PDS-1 stations or other terminals networked to the MIT
>> <https://en.wikipedia.org/wiki/Massachusetts_Institute_of_Technology> host
>> PDP-10 <https://en.wikipedia.org/wiki/PDP-10> computer running the Mazewar
>> AI <https://en.wikipedia.org/wiki/Game_artificial_intelligence> program.[11]
>> <https://en.wikipedia.org/wiki/Imlac_PDS-1#cite_note-11> Mazewar games
>> between MIT and Stanford were a major data load on the early Arpanet
>> <https://en.wikipedia.org/wiki/ARPANET>."
>> 
>> 
>> the MIT PDP-10 reference must be of Al Vezza's MIT-DM host, but yours truly
>> is kinda perplexed over the last sentence of:
>> 
>> "Mazewar games between MIT and Stanford were a major data load on the
>> early Arpanet."
>> 
>> wondering just what host at Stanford this must have been -- if not SU-AI --
>> which yours truly recalls had a couple of Imlac's -- one of which was at
>> JMC's (John McCarthy's) house and other at RWW's (Richard Weyhrauch's)
>> house -- both of which were connected with 1200 baud leased lines... hardly
>> big enough to "contribute" to "a major data load on the early Arpanet." --
>> most especially given that JMC &/ RWW didn't seem to be the mazewar playing
>> kinda folks...
>> 
>> anyone got more "history" here on this...¿¿¿
>> 
>> geoff
>> 
>> On Wed, Dec 30, 2020 at 2:22 PM Brian E Carpenter via Internet-history <
>> internet-history at elists.isoc.org> wrote:
>> 
>>> On 31-Dec-20 11:07, Dave Crocker wrote:
>>>> On 12/30/2020 11:54 AM, Bill Ricker wrote:
>>>>> The competing 16-bit design team (Edson DeCastro et al) likewise came
>>>>> from a 12-bit processor (PDP-8).
>>> The Imlac PDS-1 was also very much a 16-bit PDP-8, also (I believe)
>>> designed
>>> by ex-DEC people.
>>> 
>>>    Brian Carpenter
>>> 
>>>> 
>>>> was the core of that team four people? ...
>>>> 
>>>> 
>>>> d/
>>>> 
>>>> ps. and just to add to the whimsy, the three-person set also reminds me
>>>> of the Magical Number Seven paper. (Nevermind that it's a great read.)
>>>> 
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> 
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