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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
62 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

48 votes

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

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

44 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

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

39 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

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

34
Why wasn't ASCII designed with a contiguous alphanumeric character order?
retrocomputing.stackexchange.com

26
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

22
kernel martian source to and from same IP
unix.stackexchange.com

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

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

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

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

16
How do I disable hard disk spin down or head parking in FreeBSD?
serverfault.com

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

12
Kicad Ground Pads are not completey connected with Ground plane
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

9
Unexpected low characteristic impedance using the JLCPCB impedance calculator
electronics.stackexchange.com

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

8
4000% Performance Decrease in SYCL when using Unified Shared Memory instead of Device Memory
stackoverflow.com

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

8
USB 2.0 VBUS Filter
electronics.stackexchange.com

8
Do physical assets created directly from GPLed, copyleft digital designs (not programs or libraries) acquire the same license?
opensource.stackexchange.com

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

7
Is it possible to manually TRIM the unused blocks (free space) for an existing APFS volume?
apple.stackexchange.com

7
Why could you hear an Amstrad CPC working?
retrocomputing.stackexchange.com

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

7
Does recommended creepage distance apply to copper planes under soldermasks?
electronics.stackexchange.com

7
How do lab bench power supplies have a separate earth pin and a ground pin?
electronics.stackexchange.com

7
Can we say that a CPU is an ASIC that is designed to perform a wide range of instructions?
electronics.stackexchange.com

7
Optical TOSLINK for high voltage isolation up to 2kV?
electronics.stackexchange.com

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