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More info about the instruction set: http://en.wikipedia.org/wiki/Apollo_Guidance_Computer http://en.wikipedia.org/wiki/Apollo_Guidance_Computer And it's not h
by snorkel 17y ago
More info about the instruction set: http://en.wikipedia.org/wiki/Apollo_Guidance_Computer http://en.wikipedia.org/wiki/Apollo_Guidance_Computer
And it's not hack-free:
The Block II AGC also has the mysterious and poorly documented EDRUPT instruction (the name may be a contraction of Ed's Interrupt, after Ed Smally, the programmer who requested it) which is used a total of once in the Apollo software: in the Digital Autopilot of the Lunar Module. At this time, while the general operation of the instruction is understood, the precise details are still hazy, and it is believed to be responsible for problems emulating the LEM AGC
- profquail 17y agoI'm not a hardware guy (so please correct if I'm wrong...seriously), but if it's just that one instruction that has unknown functionality, couldn't they look at the code and the specified functionality (of all the code) and sort of reverse engineer the logic of it? Or find one of the old computers (in a museum or something) and examine the hardware in it?
- torpor 17y agoThey'd have to unwrap the instructions (hard-wire, literally) to get to the meat of it, and even then there's no guarantee they'd be able to put it all back together again. Better that it just remains curious, and that we don't use AGC Version 1.0 for future launch attempts ..