1. /aws/ (East Coast), /ay-os/ (West Coast) A
PDP-10 instruction that took any memory location and added 1 to it. AOS meant "Add One and do not Sk
IP". Why, you may ask, does the "S" stand for "do not Sk
IP" rather than for "Sk
IP"? Ah, here was a beloved piece of PDP-10 folklore. There were eight such instructions: AOSE added 1 and then sk
IPped the next instruction if the result was Equal to zero AOSG added 1 and then sk
IPped if the result was Greater than 0 AOSN added 1 and then sk
IPped if the result was Not 0 AOSA added 1 and then sk
IPped Always and so on. Just plain AOS didn' t say when to sk
IP, so it never sk
IPped. For similar reasons, AOJ meant "Add One and do not Jump". Even more bizarre, SK
IP meant "do not SK
IP"! If you wanted to sk
IP the next instruction, you had to say "SK
IPA". Likewise, JUMP meant "do not JUMP" the unconditional form was JUMPA. However, hackers never did this. By some quirk of the 10' s design, the
JRST (Jump and ReSTore flag with no flag specified) was actually faster and so was invariably used. Such were the perverse mysteries of assembler programming. 2. /A-O-S/ or /A-os/ A
Multics-derived
operating system supported at one time by
Data General. A spoof of the standard AOS system chefistrator' s manual ("How to Load and Generate your AOS System") was created, issued a part number, and circulated as photocopy folklore it was called "How to Goad and Levitate your CHAOS System". 3. Algebraic Operating System, in reference to those calculators which use
infix operators instead of {postfix notation}. [
Jargon File] (1995-11-26)
In addition suitable contents:
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