What is residence memory in c programming language?

What is residence memory in c programming language?

RAM has divided into two parts:

(1)        Extended memory (useless)

(2)        Residence memory 

In Turbo C 3.0 compiler size of residence memory is 1MB.

Residence memory:

 

When any program is executed it is stored in the
residence memory. For turbo c 3.0, it has 1MB residence
memory i.e. when we open turbo c 3.0 it stores 1MB in the
RAM.