TMRC
/
tmerk '/
The Tech Model Railroad Club at {
MIT },
one of the
wellsprings of {
hacker }
culture .
The 1959 "
Dictionary of the
TMRC Language "
compiled by Peter Samson included several terms
that became basics of the hackish vocabulary (
see especially
{
foo }, {
mung },
and {
frob }).
By 1962 ,
TMRC '
s legendary layout was already a marvel of
complexity (
and has grown in the thirty years since ;
all the
features described here are still present ).
The control
system alone featured about 1200 relays .
There were {
scram
switch }
es located at numerous places around the room that
could be thwacked if something undesirable was about to occur ,
such as a train going full -
bore at an obstruction .
Another
feature of the system was a digital clock on the dispatch
board ,
which was itself something of a wonder in those bygone
days before cheap LEDS and seven -
segment displays .
When
someone hit a scram switch the clock stopped and the display
was replaced with the word "
FOO ";
at TMRC the scram switches
are therefore called "
foo switches ".
Steven Levy ,
in his book "
Hackers ",
gives a stimulating
account of those early years .
TMRC '
s Power and Signals group
included most of the early {
PDP -
1 }
hackers and the people who
later bacame the core of the {
MIT } {
AI Lab }
staff .
This
dictionary accordingly includes a number of entries from the
TMRC dictionary (
via the Hacker Jargon File ).
[{
Jargon File }]
(
2008 -
06 -
30 )
TMRC : /
tmerk ´/,
n .
The Tech Model Railroad Club at MIT ,
one of the wellsprings of hacker culture .
The 1959 Dictionary of the TMRC Language compiled by Peter Samson included several terms that became basics of the hackish vocabulary (
see esp .
foo ,
mung ,
and frob ).
By 1962 ,
TMRC '
s legendary layout was already a marvel of complexity and has grown in the years since .
All the features described here were still present when the old layout was decommissioned in 1998 just before the demolition of MIT Building 20 ,
and will almost certainly be retained when the old layout is rebuilt (
expected in 2003 ).
The control system alone featured about 1200 relays .
There were scram switches located at numerous places around the room that could be thwacked if something undesirable was about to occur ,
such as a train going full -
bore at an obstruction .
Another feature of the system was a digital clock on the dispatch board ,
which was itself something of a wonder in those bygone days before cheap LEDs and seven -
segment displays .
When someone hit a scram switch the clock stopped and the display was replaced with the word ‘
FOO ’;
at TMRC the scram switches are therefore called foo switches .
Steven Levy ,
in his book Hackers (
see the Bibliography in Appendix C ),
gives a stimulating account of those early years .
TMRC '
s Signals and Power Committee included many of the early PDP -
1 hackers and the people who later became the core of the MIT AI Lab staff .
Thirty years later that connection is still very much alive ,
and this lexicon accordingly includes a number of entries from a recent revision of the TMRC dictionary .
TMRC has a web page at http ://
tmrc -
www .
mit .
edu /.
The TMRC Dictionary is available there ,
at http ://
tmrc -
www .
mit .
edu /
dictionary .
html .
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