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Parrallel Ports - EPP ECP etc

Discussion in 'A+' started by steveh2001, Jul 30, 2006.

  1. steveh2001

    steveh2001 Byte Poster

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    Hi guys,

    Would someone be able to help clarify the differences between the parallel port modes as im getting very confused. From what i understand:

    All IEEE1284 modes use the 25pin female parallel port to 36 centronics connector

    But the disadvantage of this 1284 standard is its only got one way communication (PC=> Periphperal)

    Nibble mode - is full communication both ways, but uses system resources and is only 50kb/s

    Byte Mode - full comm's both ways - but can go at 150kb/s

    EPP - fast, 2 way communication, including low system resources (becaues of hardware handshaking) and can go at 500-2mb/s

    and ECP - is the fastest - as it uses data compression


    Is this correct? Is this enough knowledge for the A+?

    Many thanks for your help :D

    Steve
     
    Certifications: A+,N+,CommVault,MCSA/MCSE 2003,VCP 4.1.
    WIP: ?
  2. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Not quite correct. 1284 essentialy standardized the previous industry modes, and includes bi-directional operation.
    A quick overview is here.

    Mike Meyers has a good summary in his main A+ book.

    It was the original IBM PC that was output only. Later on it was discovered that by fiddling with the status lines that you could make nybble mode work.

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+
  3. steveh2001

    steveh2001 Byte Poster

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    Ahh excellent - thanks for the web link :D
     
    Certifications: A+,N+,CommVault,MCSA/MCSE 2003,VCP 4.1.
    WIP: ?

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