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Disk Operating System (DOS) - Engineering

Q1:

Which command is executed before the others when a computer is first turned on?

A Device=c:\emm386.exe

B Device=c:\dos\himem.sys

C Prompt=$p$g

D Patch c:\dos

E None of the above

ANS:B - Device=c:\dos\himem.sys

If this command is the first line in CONFIG.SYS then yes, it's the first one executed, but do we assume it's always there?

Anyone, please give details.