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- text/11/6
- 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.
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- 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."
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- The computer then reads these
- three files. They tell it all
- about becoming a real computer.
- Once it reads these files, it knows
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- how to run programs.
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- Just like when you read a
- book, the computer puts this
- information in short-term
- memory. On a computer, this is
- the RAM. These are several I.C.
- chips that can hold hundreds of
- thousands of individual bytes.
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- 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
- AUTOEXEC.BAT file is found,
- the computer asks about the
- date and time.
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