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(NO SLIDES/FILM) [IBM]
NORMALLY: SHUTTLE & EXPERIENCES (SLIDES/FILM ... KEEP AWAKE)....
THOUGHT ABOUT: DESCRIBING HIGH TECH SPACE PGM (~SSME'S)... REMEMBERED IBM [[therefore symbol]] COMPUTERS
NOT GOOD TO BASE ENTIRE TALK ON IT: 5 COMPUTERS (SAME)
4 RUN SAME (IBM) SW / 1 RUNS INDEPENDENTLY, DIFF SW
GUESS MEMORY .... UPGRADED → 256K (!) (16x @ HOME) 
32x @ WORK
MAKES A POINT: SW CONTROLS SHUTTLE (ASCENT, ENTRY, ORBIT)
REQUIRED YEARS OF TESTING (BREADBOARD; SIMULATORS; IN STS)
CAN'T AFFORD SINGLE MISTAKE [ONCE YOU'VE GOT IT — CAN'T AFFORD TO CHANGE IT]
INSTEAD OF 256K COMPUTERS — STEP BACK:
BACKGROUND ON STS/SORTS OF THINGS STS DOES/SOME PROBLEMS↔Q&A
1970'S : TFNG (COMPOSITION)
1ST FLTS - TEST FLTS; CREW=2
NOW: CREW=5
WHAT IT DOES: ① COMMUNICATIONS SAT'S (STS-7 →2)
② SCIENCE: - 41G EARTH - LOOKING (ERBS, SIR-B) 
TELESCOPES; SPACE PROBES
③ SATELLITE REPAIR (SPACE WALKS - SOLAR MAX)
PROBLEMS: (NASA'S HAD SEVERAL; STS => 1 NO SHUTTLE LAUNCH SINCE SPR) (H LEAK)
3 SHUTTLES (4TH => REPLACE CHALLENGER)
SPRING: H LEAK ON COLUMBIA; THEN H LEAK ON ATLANTIS
LONG - STORY - SHORT SEVERAL ATTEMPTS (W/IN HRS … LOAD H, FIND LEAK)… NOT FIXED
→  GOOD NEWS. REMEMBER AFTER CHALLENGER: CRITICISM
NASA HAS LEARNED - & IS DEMONSTRATING THAT
H IS DANGEROUS - DON'T LAUNCH 'TIL YOU FIND IT
END => SAT - TRY AGAIN (3RD SHUTTLE - DISCOVERY …. NOT ONE WITH LEAK)