The document discusses time sharing and multiprogramming systems. It mentions time sharing systems, multiprogramming with a single CPU, and multiprogramming with multiple CPUs where multiple programs can be in memory and executing simultaneously by rapidly switching between them.

2. TIME SNARING
TIME SHNARING SYSTEME
MULTI PROGRAMMING

3. MULTIPROGRMMING
SINGLE CPU
MULTIPLE CPU

4. MULTIPLEPROGAMNMEMOR
Y
SINGLE CMULTIPLE
PROGRAMINEXECUTION