1.2 Memory | Version 2

1.2 Memory | Version 2

1. What are some specific instructions in ROM?

   • Why is ROM considered permanent and secure?
     • Harder to change.
     • More defense against attacks and viruses.
   • Values cannot be accidentally changed.
   • ROM stores values.
   • To keep values the same.

2. What is Virtual Memory?

   • A section of a computer storage drive which is temporarily used as RAM.
   • Written onto a file on hard drive / memory.
   • Secondary storage.
   • OS sets up virtual memory using VMM
   • Why is Virtual Memory needed?
     • To run applications on the computer that RAM cannot support.
   • How is Virtual Memory implemented?
     • VMM creates a file on the hard disk.
     • OS can then address memory.
     • Swapping or paging to move data between RAM and Virtual Memory.
     • OS moves data that is not needed.

3. What is the role of POST in the boot sequence?

   • BIOS chip preforms check.
   • Power On Self-Test
   • If fails, error message is shown.