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1993-11-26
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62 lines
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Like anybody waking up, it is
hungry. But the computer hungers
for more information. It checks to
see if a bootable disk is in drive
A:. If not, it looks for a hard
disk with system files.
A bootable disk is one that
contains "system files." These
three are MSDOS.SYS, IO.SYS and
COMMAND.COM. You might have seen
COMMAND.COM on some of your
floppies, but the other two are
usually hidden on a bootable disk.
They are there, but you don't see
them when you type "dir."
The computer then reads these
three files. They tell it all
about becoming a real computer.
Once it reads these files, it
knows how to run programs.
Just like when you read a
book, the computer puts this
information in short-term
~
te330 18 DEFAULT
memory. On a computer, this is
the RAM. These are several I.C.
chips that can hold hundreds of
thousands of individual bytes.
Next, the computer will look for
files called AUTOEXEC.BAT and
CONFIG.SYS on the bootable disk.
These are special files in which
the user can write instructions to
tell the computer to automatically
load chosen programs. If no AUTO-
EXEC.BAT file is found, the computer
asks about the date and time.
The computer has several timing
crystals which keep its thinking
organized. One is also used to keep
track of the time and date. Many
computers also have a small
rechargeable battery and an IC chip
that keeps track of the time even
when the main power switch is
turned off. This small part of the
computer is always awake.
~