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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)