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比尔盖子

Beijing, China

http://biergaizi.info

Sysadmin of Beijing GNU/Linux User Group. FLOSS and electronics hobbyist.

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Top Questions
66 votes

When was the famous "sudo warning" introduced? Under what background? By whom?

history unix asked Oct 9, 2019 at 19:39
retrocomputing.stackexchange.com

51 votes

How do you make a systemd service as the last service on boot?

systemd asked Jan 31, 2013 at 9:22
superuser.com

46 votes

Why did Axial Capacitors Fall Out of Use in the Industry?

capacitor pcb-design pcb-assembly mechanical-assembly asked Jan 7, 2020 at 19:20
electronics.stackexchange.com

41 votes

How do I unit testing my GUI program with Python and PyQt?

python qt unit-testing pyqt asked Feb 23, 2013 at 19:09
stackoverflow.com

39 votes

How do I Interface a PS/2 Keyboard without Modern Techniques?

z80 input-devices asked Mar 20, 2019 at 22:25
retrocomputing.stackexchange.com

33 votes

Why would a Intel 8080 chip be destroyed if +12 V is connected before −5 V?

power-supply integrated-circuit semiconductors nmos 8080 asked Sep 2, 2019 at 0:54
electronics.stackexchange.com

29 votes

In the original Z80 layout, where are the "traps" located? And what are their effects?

history z80 reverse-engineering asked May 29, 2019 at 2:45
retrocomputing.stackexchange.com

23 votes

Why does printf() in the parent almost always win the race condition after fork()?

c unix fork race-condition asked Jan 14, 2021 at 7:04
stackoverflow.com

23 votes

Was the IBM S/360 Responsible for Popularizating the 'A'-to-'F' Notation in Hexadecimal Numbers?

history programming ibm mainframe s360 asked Jun 6, 2020 at 10:35
retrocomputing.stackexchange.com

23 votes

Was memory corruption a common problem in large programs written in assembly language?

history assembly bugs asked Jan 21, 2021 at 9:46
retrocomputing.stackexchange.com

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Top Answers
60
Resistance of wire
electronics.stackexchange.com

36
Why wasn't ASCII designed with a contiguous alphanumeric character order?
retrocomputing.stackexchange.com

28
How did the Altair 8800 front panel load the program counter?
retrocomputing.stackexchange.com

25
Can we not simply connect a battery to a RAM to prevent data loss during power cuts?
electronics.stackexchange.com

24
kernel martian source to and from same IP
unix.stackexchange.com

21
How do I disable hard disk spin down or head parking in FreeBSD?
serverfault.com

20
What does soaking-out run capacitor mean?
electronics.stackexchange.com

18
Range view to std::vector
stackoverflow.com

17
_delay_ms() is much slower than expected (by a factor of 6) on TinyAVR 0/1 (ATTiny1604)
arduino.stackexchange.com

17
Does the word voltage exist in academic engineering?
electronics.stackexchange.com

16
Did a blown fuse in my multimeter damage my multimeter?
electronics.stackexchange.com

16
Does ATtiny RESET pin need a resistor?
electronics.stackexchange.com

15
4000% Performance Decrease in SYCL when using Unified Shared Memory instead of Device Memory
stackoverflow.com

15
Why am I Seeing A Weird "Notch" on the Data Line For Some Logical 1s?
electronics.stackexchange.com

14
Impedance/Termination of Marvell PHY
electronics.stackexchange.com

13
Kicad Ground Pads are not completey connected with Ground plane
electronics.stackexchange.com

11
USB shielding, device or host side?
electronics.stackexchange.com

11
USB 2.0 VBUS Filter
electronics.stackexchange.com

11
What proprietary AT&T code/features were removed in BSD Net1 (/2), and BSD 4.4 Lite (/2) from the original 4.3BSD codebase?
retrocomputing.stackexchange.com

10
How can a marginal connection become "good" by just applying a little more voltage?
electronics.stackexchange.com

10
Is it possible to manually TRIM the unused blocks (free space) for an existing APFS volume?
apple.stackexchange.com

10
Unexpected low characteristic impedance using the JLCPCB impedance calculator
electronics.stackexchange.com

10
Can two interfering light beams create radio waves?
electronics.stackexchange.com

9
Do physical assets created directly from GPLed, copyleft digital designs (not programs or libraries) acquire the same license?
opensource.stackexchange.com

8
Insulation safety ratings (working and withstand voltage) of fiber optics cables
electronics.stackexchange.com

8
Are PCIe and USB 3.0 the same interface?
electronics.stackexchange.com

8
How do I Monitor Mouse Movement Events in All Windows (Not Just One) on X11
stackoverflow.com

7
Some questions about a series pass transistor & op amp voltage regulator
electronics.stackexchange.com

7
Mathematicians who wrote fiction
hsm.stackexchange.com

7
What is "common-mode" noise?
electronics.stackexchange.com

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