User:Kublai/temp

Number system

• floating point
• overflow and under flow and carry

Non mumeric data

• ASCII vs EBCDIC(by IBM and collapsed)
• BIG5
• unicode
• JPG, MPG,MP3 (mere)

Modern Computer Architecture

• Stack architecture(data structure : stack/one address/operand machine instruction, push , pop, aero address/operand machine instruction)
• pipeline and pipelining(*)
• superscaler machine (two ALU,)
• RISC(UNIX, many registers, less addressing mode, small instruction set) and CISC (80x86,less registers, many addressing modes)
  • compiler compiler complxity,
• parallel processing

Past paper

• 2001 I 7(parallel processing)
• 2003 I 5
• 2004 I 10

==

Data transmission

• serial : COM port : bit by bit
• parallel : LPT/VGA : word by word
• synchronous (CPU -> memory) common clock
• asynchornous(through MODEM) , start bit, stop bit , no common clock
• simplex, duplex and half duplex
• multiplexing :
• transmission error checking
  1. parity check
  2. parity check
  3. CRC check, hamming code,etc.

I/O programming

• DMA Dircect Memory

CPU                  network card
Pooling : CPU ask each device for service one by one
Interrput : devices send NIRT(interrupt request) signal to CPU in order to be served