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parallel ports vs. serial ports
7
parallel ports vs. serial ports
How does it work?
Overview
-parallel port can only send information to the computer
-serial port can send both to and from the computer
-parallel ports have 2 rows of minimum 25 pins
-serial ports have two rows with 9 pins
-1pin=1function
Images and diagrams
CONFIGURATION
serial ports and parralel ports today
Speed comparison
Memory Address
0x3f8
0x2f8
0x3e8
0x3e8
serial port
COM 1
COM 2
COM 3
COM 4
Interrupt
IRQ 4
IRQ 3
IRQ4
IRQ 3
Com3 and COM4 can not work together because they have the same Interrupt, same for COM2 and COM 4
-seial and parallel ports have largely been replaced by USB (universal serial port)
-some ancillary devices still allow for connection by both means
-parallel can support rates up 100 kilobytes/second
-parallel was popular because it moved eight bits at a time over parallel connection
-serial can only support rates up to 115 kbps
-later technology advances pushed serial speeds up to 460 kbps
-the serial and parallel port were the most common means of data transfer and communication
-considered cutting edge for most of PC history
-the serial and parallel port have largely been replaced by the use of USB ports
-they are used to connect peripheral devices to the computer
Refrences
-http://www.wisegeek.com/what-are-serial-ports.htm
-http://www.wisegeek.com/what-is-the-difference-between-a-serial-and-parallel-port.htm
-http://www.wisegeek.com/what-is-a-parallel-port.htm