February 2nd Friday (一月　二日　金曜日）

  Osophobia prevailed among programmers.  In the early computer system there is not
the concept of operation system.  With developing of module technique of software,
operation system born the earth.  At sometime, early operation system might just be
a set of system calls or functions.  No matter what a operation system became a hardware
platform.  Application programmers can focus their mind on developing application
logics regardless hardware's detail.

  In other words, operation system help more and more people join into the group of
developing.  At once, application programmers begin to ignore of the technique of hardware
until embeded system coming back.

  In my eye, what underware is to human body, that operation system is to hardware.

  When it comes to operation system, most people can think Windows, MacOS, Linux, FreeBSD,
and so forth, at once.  They all are hugh operation system.  A embeded operation system can
be so small or tiny.  For example, GUI is not necessory for a embeded system.