MAC address

Every network interface card (NIC) produced in the world has its own unique MAC address. A MAC address is made up of 6 sets of hexadecimal numbers (two-characters each), e.g. A1:B2:C3:D4:E5:F6

BGA component

BGA stands for Ball Grid Array. A web definition from PrincetonUSA explains it as, "A type of memory chip with solder balls on the underside for mounting. Use of BGA allows die package size to be reduced because there is more surface area for attachment. Smaller packaging allows more components to be mounted on a module, making greater densities available. The smaller package also improves heat dissipation for better performance".

Hspice multiplicity

Given a component with a multiplicity value M , the simulator treats this component as if there were M such components all connected in parallel.

svf

Serial Vector Format used in boundary scan tests of electronics

tar, gzip, zip, bzip2

If want to make a folder into a file, just tar
tar -cvf XXX.tar XXX (create)
tar -xcf XXX.tar (unpack)

if want to compress, then gzip, zip, or bzip2 a tar file
command to expand is gunzip, unzip, and bunzip2

MAC X11 window and font size change

The most simple way is adding the following new command in the X11-> application -> customize
xterm -geometry 72x34+100+40 -fn *-fixed-*-*-*-20-* &
BTW, use command+optin+A to leave the stupid full screen mode

linux search a file

find ./ -name 'program.c'