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Computer Hardware - Engineering

Q1:

In the DOS memory model, the HIGH Memory Area (HMA). is the _____ memory.

A Last 64k of conventional

B Last 64k of extended

C First 64k above conventional

D First 64k of extended

E None of the above

ANS:D - First 64k of extended

In computing, protected mode, also called protected virtual address mode, is an operational mode of x86-compatible central processing units (CPUs). It allows system software to use features such as virtual memory, paging and safe multi-tasking designed to increase an operating system's control over application software.

Address up to 16 MB of memory in protected mode. The 1 MB barrier also remained as long as the 286 was running in real mode, since DOS required real mode which uses the segment and offset registers.