4 ms·
It's surely super fussy, but at least it's a repeating pattern and not as fussy as wiring rope memory. That's a form of read-only memory used in the space progr
by astrodust 8y ago
It's surely super fussy, but at least it's a repeating pattern and not as fussy as wiring rope memory. That's a form of read-only memory used in the space program where the bits are wired in by hand to represent the stored program bit by bit.
https://www.youtube.com/watch?v=P12r8DKHsak https://www.youtube.com/watch?v=P12r8DKHsak
- monocasa 8y agoDefects in core rope memory should be way easier to fix FWIW.
- kens 8y agoThey could fix bad cores in a core plane. They cut the X and Y wire to remove the bad core. Then new X and Y wires were rethreaded through the old cores and the new core. They tested planes after stringing the X and Y wires, before adding the sense and inhibit wires. If they found a problem after the sense and inhibit wires were threaded through, I don't know if they needed to remove them or if they could add a splice.
- astrodust 8y agoNot if you're in space on a mission.
- anyfoo 8y agoYes, but since you mentioned the repeating pattern (or absence thereof), I think we thought you were talking about mistakes in the bit pattern, and not material failure? And in this case, I certainly hope they just read out all the bits and compared them against expectations before launch.
- astrodust 8y agoIt's surely one of those things that's very, very fussy to assemble but relatively easy to verify. Someone built their own rope memory reader (https://www.youtube.com/watch?v=WquhaobDqLU https://www.youtube.com/watch?v=WquhaobDqLU) to access data stored in the Apollo modules. Assembling core memory is a lot easier, there's a very simple pattern, and verifying that it works correctly isn't that hard either. This is like weaving a complicated rug with many colors and a single-color rug.