By "main memory" I assume you mean Primary Storage. This would be your RAM (Randon Access Memory)
DRAM
A visual memory trace is called "icon" and such memory (the visual memory) is called "iconic memory".
primary memory is built in memory on a computer it is the main type of memory.... eg RAM ROM and HDD
Such memory is called ROM.
There three main considerations to use when you choose memory. The three are speed, type of memory and the size of the memory.
yes
Catch memory is internal memory to do the work it can stores the given input to the system
what is a semiconductor material? what are its main types, explain each type
The Mother Board!
Yes. The type of video memory has nothing to do with main system memory.
main memory (RAM) / disk / tape / etc read only / read-write
A: They are called RAM or Random access memory