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Eric Rucker
Works at Dell
Attended Central Ohio Technical College
Lives in Newark, OH
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Eric Rucker

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I might have a problem.

(The UPS is near the top for a reason, these aren't in a rack.)
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Hi
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No surprises: there's fun to be had with other storage media, but the write-up is good.
Today at the Chaos Computer Congress (30C3), xobs and I disclosed a finding that some SD cards contain vulnerabilities that allow arbitrary code execution — on the memory card itself. On the dark side, code execution on the memory card enables a class of MITM (man-in-the-middle) attacks, ...
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Eric Rucker

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Remember when computer programs were careful?
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It annoyed me that it took the document off the screen—precluding proofreading whilst it was busy.
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Eric Rucker

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Got the Mimeo running. Video section has an issue with a bad shift register, but the processor section is clearly running and getting the right things into the video section, and the video section is mostly doing the right things.

Tomorrow's plan is to do the finishing touches on the motherboard (install slot connector, add a couple more jumpers, install the ACI), and celebrate.

Future plans are to install the replacement shift register, finish the mounting board, build the rest of the case (which is going to be simplistic, but should be elegant and effective), get a keyboard going, get a slot expander, and install a CFFA1 (because why not). #mimeo1   #apple1
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+Brandon Cholodenko Yes, I did. I had contacted Wendell on Applefritter (his username there is wsander), and he recently had some keycap and adapter kits made.
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Alright, got everything but the slot connector soldered! (The manual leaves that for last, after the system is brought up and fully tested.) FWIW, resolution on the caps was... use the 1.0 µF ones.

And, yes, the top 2400 µF cap is upside down (that is, the printing is underneath the cap - it doesn't affect functionality in any way), I know, I know. Realized it after I got it soldered in, decided I didn't want to unsolder that thing, sitting right on a whole bunch of ground plane. (It wasn't as bad as the 7905, though, that thing was a bear.)

Tomorrow's project: connect the transformers up, and go for first power up with no chips, to check out the power supply, I think. #mimeo1   #apple1
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Oh, I know. My regulated iron (an Aoyue 937+) came in extremely handy here, and it was definitely able to keep up, it just took a while to get the heat in. Bigger tip probably would've helped.
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Grr... Unicorn Electronics included 1.0 µF caps instead of the 0.1 µF that the Mimeo assembly guide calls for. (The PCB does say 1.0, but Apple actually used 0.1, and presumably there's a reason for that.)

Got all sockets installed, and the six other non-electrolytics. Now I'm at a stopping point, until I can get the correct caps, which I'd guess would be Tuesday at the earliest. (There are periodic short checks in the manual, and yes, I could go on, but I'd rather follow the manual closely. In no rush, so might as well wait.) #mimeo1   #apple1  
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Right, it's maybe 0.01 ohm for 100 nF and maybe 0.04 ohm for 1 µF. This means at 5 V the maximum possible current for shorting the higher frequency will be just 125 A, instead of 500 A. This doesn't matter, because the resistance of the TTL transistors are much higher, so they are the limiting factor (even if hundreds of them switch at the same time). It would even work without capacitors (try it, it won't start to smoke), but would probably generate some EMI noise, so you could not listen to MF radio stations near it anymore. To be sure, ask the experts in the EEVBlog forum if it matters for your circuit, I'm just a programmer :-)
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Have him in circles
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Eric Rucker

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Welp. This is... nasty.
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Eric Rucker

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Woo, passed my Element 3 exam yesterday, at 100%. Now I just need to actually get an antenna setup to transmit on HF.
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Awsome!
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Got the latest incarnation of my mainframe going, housed in an RS/6000 7011-250 that I got from +Noah Axon.
So, I finished resurrecting my mainframe the other day. When I was in Kansas City for KansasFest, I bought an RS/6000 7011-250, which uses the smallest chassis capable of holding 32-bit MCA cards that IBM ever produced – for comparison, I'd say it's about the size of a Quadro 610 or Power Mac ...
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Hat tip to +Noah Axon.
 
...and yes, this is why I get annoyed at products labelled "chemical free."
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Decided to go ahead and build the cassette interface, while waiting on the capacitor issue to be resolved. #mimeo1   #apple1
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I guess by the time you went to all the trouble, the onboard serial port would have become much a more attractive option -- but I like the way you're thinking.  :-)
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Have him in circles
175 people
Jeff Donaldson's profile photo
Charlie Migliore's profile photo
Bike Commuter Cabal's profile photo
Beatriz Podsiad's profile photo
Matt Phelan's profile photo
Ayrton Hathaway's profile photo
Andrew Molloy's profile photo
Brett Coulthard's profile photo
Robert Greenfeather's profile photo
Work
Employment
  • Dell
    Client Field Services Sr. Analyst, 2010 - present
  • Robert Half Technology
    Contractor, 2008 - 2009
  • Excel Academy
    Computer Technician, 2005 - 2008
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Newark, OH
Previously
Marengo, OH - Johnstown, OH
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Introduction
Computer nerd (both modern and retro) since I was 3, car nut almost as long, plus way too many other interests (ranging from typewriters to amateur radio).
Education
  • Central Ohio Technical College
    Associate of Business in Computer Programming Technology, 2003 - 2007
  • Excel Academy
    1996 - 2006
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Gender
Male