Search found 67 matches

by Elf
Sun Apr 30, 2017 4:14 pm
Forum: Miscellaneous Operating Systems/Hardware
Topic: QNX+X11
Replies: 4
Views: 62

Re: QNX+X11

Most people these days use RDP or Citrix thin client terminals for that sort of use case. There are a bunch made by Wyse (now owned by Dell), HP, etc. They're just cheap PCs with a Linux based or custom OS, and you can usually turn off the peripheral ports (which in any case aren't used for much exc...
by Elf
Sun Apr 23, 2017 10:37 pm
Forum: SGI: Hardware
Topic: My Fuel now has a power supply and Dallas chip, but no graphics yet. Can I connect to it over serial?
Replies: 12
Views: 225

Re: My Fuel now has a power supply and Dallas chip, but no graphics yet. Can I connect to it over serial?

Ouch! I used to hack up serial cables in a similar way, years ago. I would recommend getting a bunch of DB9 and DB25 F/M to RJ-45 shell adapters and a pair of DB-9 and DB-25 serial break out boxes. Convert everything back and forth from standard DEC (a.k.a. Cisco) pattern modular jack serial connect...
by Elf
Sat Apr 15, 2017 8:04 pm
Forum: SGI: Hardware
Topic: SGI Power Supply Tester
Replies: 5
Views: 248

Re: SGI Power Supply Tester

Thanks :)
by Elf
Sat Apr 15, 2017 3:38 pm
Forum: SGI: Hardware
Topic: SGI Power Supply Tester
Replies: 5
Views: 248

Re: SGI Power Supply Tester

I just received the first set of boards from OSH Park today and they look great! Unfortunately... @Wolfcry just ran our van into a rock wall today and it is looking like it will cost a lot to repair. So I cancelled my outstanding Digikey orders and it looks like I will have to put this off for a whi...
by Elf
Tue Apr 11, 2017 10:40 pm
Forum: Everything Else
Topic: What pointless thing are you doing right now?
Replies: 203
Views: 12826

Re: What pointless thing are you doing right now?

Sounds like you tried some cheap bulbs and got burned by faulty power supplies. I've had good luck with Hyperikon (IMO they are the best), CREE, Samsung, and Luxeon/Lumileds (for automotive). I would avoid Philips, TCP, Feit, or anything with the word "smart" in the product name. [...] So...
by Elf
Mon Apr 10, 2017 12:04 am
Forum: Everything Else
Topic: What pointless thing are you doing right now?
Replies: 203
Views: 12826

Re: What pointless thing are you doing right now?

So you have both huge inefficiencies and mercury hazards which could be avoided, not to mention cri and flicker would be drastically improved. Modern T8 tubes and ballasts can actually be more efficient than off the shelf 120VAC driven LED bulbs, if not at least usually on par: https://en.wikipedia...
by Elf
Sun Apr 09, 2017 8:08 pm
Forum: SGI: Hardware
Topic: Indigo Keyboard/Mouse converter
Replies: 22
Views: 1411

Re: Indigo Keyboard/Mouse converter

For the interested, I bought one of these recently on eBay again: http://www.ebay.com/itm/152302569444 Looking at the original design, I am sure it could be slimmed down from two PICs and to drop the linear regulator for less power consumption. Maybe use an ARM Cortex M0 now that they're available v...
by Elf
Thu Apr 06, 2017 7:50 am
Forum: SGI: Hardware
Topic: SGI Power Supply Tester
Replies: 5
Views: 248

Re: SGI Power Supply Tester

Interesting! So you've got external Rload resistors to dissipate the power, right? If so, the value here compared to, let's say, a load resistance and an oscilloscope is to protect the PSU in case of a mishap? How would this scale to bigger PSUs, which can put 1000VA into a single rail? Ah, yes. Fo...
by Elf
Wed Apr 05, 2017 10:18 pm
Forum: SGI: Hardware
Topic: SGI Power Supply Tester
Replies: 5
Views: 248

SGI Power Supply Tester

So, I am still working on the large stack of SGIs . I was warned that some of the power supplies might be in an unknown condition (e.g. worthy of starting up in series with a lightbulb), so the first thing I am doing is testing them. My main concern is not damaging any of the computer hardware due t...
by Elf
Sat Apr 01, 2017 12:03 pm
Forum: Everything Else
Topic: Which is the fastest solution for storage?
Replies: 3
Views: 120

Re: Which is the fastest solution for storage?

I would go for SAS. Multilane connections give good speed, reasonably inexpensive, and Fibre Channel seems to be on the outs (getting replaced by iSCSI over Nx10GigE). I don't think there is much you can do with just 2TB of spinning disk (in any configuration) that will challenge the bandwidth of ei...
by Elf
Mon Mar 27, 2017 1:32 am
Forum: SGI: Discussion
Topic: Hardware is Cheap, Programmers are Expensive
Replies: 23
Views: 704

Re: Hardware is Cheap, Programmers are Expensive

Is there any specific theory that you can rely on a developer to know? I'm having trouble thinking of any. Extreme or Scrum are not theories in this sense. It's the difference between "a craft" and "a discipline". Right, I would classify Extreme or Scrum as project management me...
by Elf
Mon Mar 27, 2017 12:17 am
Forum: SGI: Discussion
Topic: Hardware is Cheap, Programmers are Expensive
Replies: 23
Views: 704

Re: Hardware is Cheap, Programmers are Expensive

Elf: your real world example perplexes me. This programming team of "rockstars" with no technical debt didn't see fit to hire a DBA? Without knowing the details, 20+ page SQL queries point to an undisciplined schema. The greenfield infrastructure build-out had no technical debt (i.e. ther...
by Elf
Sun Mar 26, 2017 9:49 pm
Forum: SGI: Discussion
Topic: Hardware is Cheap, Programmers are Expensive
Replies: 23
Views: 704

Re: Hardware is Cheap, Programmers are Expensive

I think the problem with the "hardware is cheap" mentality is that it seems to assume the function between programmer time and attention vs infrastructure resources consumed is linear. Pay a little less attention to code, spend a little more on infrastructure, and vice versa. From working ...
by Elf
Tue Mar 21, 2017 11:45 pm
Forum: Apple
Topic: The Problem with Apple
Replies: 89
Views: 2158

Re: The Problem with Apple

Grab a high impedance meter and you can get a reading on just about any switching power supply because of the Y capacitors, just like it says in the eevblog forum. Well, just about any ungrounded switching power supply. Important distinction! When grounded, the leakage currents (intentional, via Y ...
by Elf
Mon Mar 20, 2017 7:09 pm
Forum: Apple
Topic: The Problem with Apple
Replies: 89
Views: 2158

Re: The Problem with Apple

I just saw something funny in the "form over function" department, today. Apparently Macbook power supplies these days have two-prong "short plug" configurations that cause them to float at a high voltage with respect to ground? ⋅  http://www.eevblog.com/forum/chat/does...

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