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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
58 votes

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

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

39 votes

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

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

35 votes

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

systemd asked Jan 31 '13 at 9:22
superuser.com

33 votes

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

z80 input-devices asked Mar 20 '19 at 22:25
retrocomputing.stackexchange.com

27 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 '19 at 0:54
electronics.stackexchange.com

24 votes

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

history z80 reverse-engineering asked May 29 '19 at 2:45
retrocomputing.stackexchange.com

22 votes

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

python qt unit-testing pyqt asked Feb 23 '13 at 19:09
stackoverflow.com

17 votes

Does Impedance Matching Imply any Practical RF Transmitter Must Waste >=50% of Energy?

amplifier rf impedance-matching asked Jul 23 '19 at 8:07
electronics.stackexchange.com

17 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 '20 at 10:35
retrocomputing.stackexchange.com

16 votes

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

history unix bsd asked Apr 26 '20 at 16:02
retrocomputing.stackexchange.com

1 2 3 4

Top Answers
59
Resistance of wire
electronics.stackexchange.com

27
Why wasn't ASCII designed with a contiguous alphanumeric character order?
retrocomputing.stackexchange.com

23
Can we not simply connect a battery to a RAM to prevent data loss during power cuts?
electronics.stackexchange.com

20
kernel martian source to and from same IP
unix.stackexchange.com

19
How did the Altair 8800 front panel load the program counter?
retrocomputing.stackexchange.com

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

16
_delay_ms() is much slower than expected (by a factor of 6) on TinyAVR 0/1 (ATTiny1604)
arduino.stackexchange.com

14
Does ATtiny RESET pin need a resistor?
electronics.stackexchange.com

13
Why am I Seeing A Weird “Notch” on the Data Line For Some Logical 1s?
electronics.stackexchange.com

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

10
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

9
Impedance/Termination of Marvell PHY
electronics.stackexchange.com

8
How do I disable hard disk spin down or head parking in FreeBSD?
serverfault.com

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

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

6
How to teach the Z80 to count milliseconds and microseconds like Arduino?
retrocomputing.stackexchange.com

5
How do I Monitor Mouse Movement Events in All Windows (Not Just One) on X11
stackoverflow.com