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Comment Re:Are there any old drives around that read these (Score 1) 481

I seem to recall from my BIOS writing days with CP/M, that the 8" drives had twice the data rate of the 5" drives. They also spun faster, 360 RPM vs 300 RPM. The 8" IBM format was soft sectored 26 sectors of 128 bytes, and the 5" used 16 sectors of 128 bytes or something like that. too many numbers to remember.

At any rate, the four 8" floppies that I still have in my meager collection are all different, for different CPUs, OSes, languages, different sector formats, etc. The closest I came to inter-system compatibility was to write a CP/M floppy reading program for the PDP-11.

Comment Parts to finish a 3D printed design (Score 1) 69

Many useful items that one could build require some metal bits in addition to 3D printed parts. I've recently encountered this situation when trying to make a little gizmo with motor drive. Small gears, shafts and so forth are very hard to come by. Have you considered starting an ancillary industry that provides the sorts of things that the company Small Parts used to offer, before Amazon killed them?

Comment Re:Stuxnet (Score 3, Informative) 245

Yes, it was a USB flash drive with a firmware update.

I work on a telescope whose Siemens PLC is so old that it has a PROM in a 40 pin DIP package for firmware updates. Not that we've touched the firmware in 20 years. After all, it works. And it ought to work for another 20 years, as long as we replace the dried-out aluminum electrolytic capacitors regularly.

Comment Re:They don't know you. Two resumes, one degree (Score 1) 281

I have no degree, but in 35 years I've never had to be selected from a pool of candidates. What's it like to have to compete for a job?

I worked my way through college at the school, building exotic computer systems for grad student research projects. I noticed one day that I was learning a lot more in the job than in the classes.

Now, 30 year later, and after 20 years in industry, I work at the same university, building electronics for telescopes. I suppose I could have gotten further with a degree, but not much further. At my performance reviews, I ask my boss to please not promote me to management.

Comment They don't care about real dangerous things (Score 4, Interesting) 289

Story: I walked into the Detroit airport a couple years ago while wearing the Video Coat. The nice TSA people marked my entire family's boarding passes SSSS. They inspected us thoroughly, including the eight 5 AH Chinese LiPo battery packs used to power the coat. These are the no-protection-board version with the factory connectors that let you plug two batteries together like BIG 9V batteries. They will happily put out 100 amps.

Had we been 'the type', we could have started four fires in the cabin that day.

Comment Re:Year 15 here (Score 1) 177

I am in a similar situation, but only 12 years. The people above me are getting near retirement age, but lots of folks stick around until their seventies around here. I have a side business and work part-time, to keep the interest level up and reduce unreasonable demands on my time. And do volunteer work with high school kids, doing robotics. That's fun.

Comment Hits the nail on the head (Score 2, Informative) 360

This article is so right! He has found a way to express something that's been bugging me for a long time. I love his comparison of a policeman to a song writer.

The other thing about copyright is that it's not the creative people who make money forever off of their own work, it's the corporations that manufacture the plastic discs who make the money forever off of the songwriters' work.

Comment Re:They know your name anyway (Score 2) 140

I have a real account, and I manage a couple groups. One (a local bike ride) receives a steady stream of requests for new members to join the group. Half of these are fake Chinese or Indian accounts - it's obvious from their profiles. The rest are real local folks. I have no idea how that maps into the total number of fake IDs.

Comment Re:Radio telescope - not exactly "skywatching" (Score 1) 201

We only use one receiver at a time, so it's not a problem. A poster written by one of our grad students that gives an idea of the telescope's capabilities is here.

The temperature scale on the graphs (temperature = signal strength) gives you an idea of the absurdly high sensitivity of the system. Some of those graphs are in milliKelvin!

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