- Decompiler help please - 2 Updates
- Noise Suppression - 1 Update
| whit3rd <whit3rd@gmail.com>: Nov 26 11:35AM -0800 On Sunday, November 24, 2019 at 5:33:08 PM UTC-8, Paul Drahn wrote: > >>>>>> but maybe I can decipher it anyway. > Just be aware that sometimes trash is included in EPROMS to stop what > you are trying to do! Three things to look out for: the ordering of the data bits can be scrambled; probably you can trace those to the CPU pins the ordering of the address bits can be scrambled, and some may be hard to trace to the CPU pins the data and/or the address might go through inverting transceivers, which changes the bit-is-a-one /bit-is-a-zero identity. |
| Tim R <timothy42b@aol.com>: Nov 27 06:46AM -0800 > for the delay. So I can copy the EPROMs just fine but I would really > like the ladder programs so that I can make some changes to the > machine. I'm sure you know this but I've been bitten once and it may be worth mentioning. I understand you're trying to back up your EPROM holding your program. We had a similar problem in a manufacturing plant, probably with an Allen Bradley PLC or similar. (it's been a while) The program went bad, we got the backup EPROM, and uploaded the saved program. Except we didn't. The wording of upload and download was ambiguous and we accidentally saved the bad program from the machine onto the EPROM. We had one extra EPROM in the safe, got that out and ………… did exactly the same thing. Everything was ladder logic and I came to hate those hardcopy printouts, but with enough time and patience we could type it back in. Ladder logic was theoretically understandable to the electricians but it violates every single concept in programming. Every line can refer to any other line - no modular programming, no single entry single exit, etc. |
| bruce2bowser@gmail.com: Nov 27 06:43AM -0800 >> Thank you ! >A surge protector has only limited effectiveness on "outgoing" surges. Not none, > limited. Hook the fridge up to a surge protector. |
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