Computing Revision-filling the gaps

Computing Revision-filling the gaps

1. Computer hardware

   • Cache memory-This is memory used to allow the transfer of data from RAM to the CPU to be a faster process.This is done by having a small amount of static RAM where frequently used instruction and programs are kept
   • And gate- 1 and 1 = 1, 0 and 1 = 0, 0 and 0 = 0
     • Or gate- 1 and 1= 1, 0 and 1 = 1, 0 and 0 = 0
       • Not gate- 1 = 0, 0 =1
   • Flash memory is a non volatile memory is considered to fast in its data transfer it also requires small amounts of power yet it is more expensive that other memory such as magnetic or optical

2. Database

   • Record-A store of one individuals data.
   • Form-A user friendly way of entering a inoformation.
   • Queries-A search for field with that meet a certain criteria

3. Networks

   • Stand alone computer- a computer separatefrom all other computers and devices
   • Star Topology- Most common type of network topology, Few data collisions ,Fast , Can set up independent segments , Hub can be another node, or switch
   • Ring Topology -One common linking cable , Passes all nodes, One direction traffic, Fast performance, If one node fails the whole network fails
   • Bus Topology, One common linking cable, Nodes connected off the cable, Cheap, Slows down when heavy traffic, Lots of data collisions, Breakage to cable affect whole network, Limited distance covered