,,PDP-#G
,THE ,,PDP-#G SHOULD BE A FOOTNOTE  A
MODEST ,,DEC MIDLINE MACHINE3 #AH-BIT1
INTRODUCED #AIFD1 @S#GB1JJJ1 ONLY #ABJ
SOLD1 ESSENTIALLY THE SAME INSTRUCTION
SET AS THE ,,PDP-#D AND ,,PDP-#I IT SAT
BETWEEN4 ,IT WAS ,,DEC'S FIRST
WIRE-WRAPPED MACHINE AND ITS FIRST TO
USE ,FLIP-,CHIP MODULES1 AND IT RAN
,D,E,CSYS  ,,DEC'S FIRST SMALL-COMPUTER
,,OS4 ,UNREMARKABLE4 ,EXCEPT FOR ONE
SPARE UNIT SITTING IN A CORNER AT ,BELL
,LABS4.<CITE3 .<,,PDP-#G AND THE
BITSAVERS ARCHIVE  THE SPECS1 THE #ABJ
UNITS1 THE ,FLIP-,CHIP_/WIRE-WRAP
FIRSTS1 AND ,D,E,CSYS.>.>
,IN #AIFI1 ,KEN ,THOMPSON  EXILED FROM
THE ,MULTICS PROJECT WHEN ,BELL ,LABS
PULLED OUT  WANTED TO KEEP PLAYING
,SPACE ,TRAVEL1 A PLANETARY-MOTION GAME
HE'D WRITTEN1 AND WANTED A MACHINE TO
PLAY IT ON4 ,THE SPARE ,,PDP-#G WAS
AVAILABLE4 ,SO HE WROTE A FILE SYSTEM
FOR IT4 ,AND A KERNEL4 ,AND A SHELL1 AN
ASSEMBLER1 AN EDITOR  A COMPLETE
OPERATING ENVIRONMENT IN ASSEMBLY1
INITIALLY WITHOUT EVEN A NAME3 ,BRIAN
,KERNIGHAN DUBBED IT ,UNICS1 A PUN ON
,MULTICS "<ONE USER1 NOT MANY">4 ,WITHIN
A YEAR THEY'D MOVED TO A ,,PDP-#AA  AND
DROPPED THE JOKE SPELLING FOR
,UNIX4.<CITE3 .<,,PDP-#G  ,THOMPSON'S
#AIFI ,UNICS ON THE SPARE ,,PDP-#G1 THE
,MULTICS PUN1 AND THE MOVE TO
,,PDP-#AA.>.>
,THE MOST CONSEQUENTIAL SPARE MACHINE
EVER
,THE ,,PDP-#G VERSION OF ,UNIX IS THE
UR-,UNIX3 EVERYTHING SINCE  THE
HIERARCHICAL FILE SYSTEM1 THE SHELL1 THE
IDEA THAT AN ,,OS IS A PROGRAM YOU CAN
CARRY  DESCENDS FROM WHAT ONE MAN TYPED
INTO A MACHINE ,,DEC SOLD #ABJ OF4
,THOMPSON WROTE IT IN ,,PDP-#G ASSEMBLY
ON A MACHINE SO MINOR ,,DEC BARELY
MARKETED IT2 THE SEED SAYS IT BEST  AN
UNREMARKABLE MACHINE MADE IMMORTAL BY
WHAT WAS SKUNKWORKS'D ONTO IT4 ,IT'S THE
SAME PATTERN AS ,,MUMPS1 WHICH WAS
ITSELF BORN ON A ,,PDP-#G3 THE CHEAPEST1
MOST NEGLECTED MACHINES KEPT BECOMING
THE CRADLES OF THE MOST DURABLE
SOFTWARE4.<CITE3 .<,,PDP-#G  THE ,UNICS
ORIGIN1 AND ,,MUMPS FOR THE SAME
MACHINE'S SECOND FAMOUS BIRTH.>.>
,UNIX HAS A MIDDLE NAME MOST PEOPLE
NEVER LEARN3 "9"9,UNICS"9"9  ,BRIAN
,KERNIGHAN'S PUN1 8A CASTRATED ,MULTICS0
"<ONE USER INSTEAD OF MANY">4 ,THE
,,PDP-#G IT RAN ON HAD #D;,K WORDS OF
CORE4 ,THE WHOLE FIRST ,,OS  KERNEL1
FILE SYSTEM1 SHELL  FIT IN MEMORY
SMALLER THAN THIS PAGE4
,WHERE IT SITS
,BETWEEN ,,PDP-#A "<WHERE THE GAMES AND
THE HACKERS BEGAN"> AND ,,PDP-#H "<WHERE
THE MINICOMPUTER BECAME A PRODUCT
CATEGORY">1 THE ,,PDP-#G IS THE QUIET
MIDDLE CHILD WHOSE ONLY JOB WAS TO BE
SPARE  AND WHOSE SPARENESS IS EXACTLY
WHY ,THOMPSON COULD BUILD ,UNIX ON IT
WITHOUT ASKING ANYONE'S PERMISSION4
,CHECK YOUR UNDERSTANDING
- .< .> ,WHO WROTE THE FIRST ,UNIX1 ON
WHAT MACHINE1 AND WHY8 - .< .> ,WHAT WAS
,UNIX ORIGINALLY CALLED  AND WHAT WAS
THE PUN8 - .< .> ,HOW MANY ,,PDP-#G;S
WERE BUILT1 AND WHAT DID ONE COST8 - .<
.> ,WHAT WAS ,D,E,CSYS8
#A  "9"9,KEN ,THOMPSON"9"91 #AIFI1 ON A
SPARE ,,PDP-#G AT ,BELL ,LABS  INITIALLY
TO RUN HIS "9"9,SPACE ,TRAVEL"9"9 GAME
AFTER ,MULTICS COLLAPSED4 #B 
"9"9,UNICS"9"9  ,KERNIGHAN'S PUN ON
,MULTICS "<8ONE USER1 NOT MANY0">4 #C 
"9"9#ABJ"9"91 AT "9"9@S#GB1JJJ"9"9  A
DELIBERATELY CHEAP MIDLINE MACHINE4 #D 
,,DEC'S "9"9FIRST OPERATING SYSTEM"9"9
FOR ITS #AH-BIT FAMILY  SHIPPED #AIFE
FOR ,FORTRAN_/ASSEMBLY WORK4