Parrallel Ports - EPP ECP etc

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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

Steve

 

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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.

 

Ahh excellent - thanks for the web link