Need help quick!!! EPP and ECP

Are EPP and ECP the two main printer standrads in connection with parallel? If so whats the main differences between both?

Are they both transfering data at 8 bits? or is EPP 4 bits?
I know ECP uses DMA and data compression so this is a main differnece of the two.

However are these the only differences? I really need to know if they are both 8 bit or not.
The technotes say they are both 8 bit but other notes i have say EPP is 4 bit!

Thanks very much for your help!

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Comments

janmike

From the Techexam study notes,
http://www.techexams.net/technotes/printers.shtml

Parallel (LPT, IEEE 1284)
This is the most common used connection today.
-EPP / ECP
In the CMOS you are able to configure a parallel port to use EPP or ECP. Enhanced Parallel Port and Extended Parallel Port are both bi-directional standards, operate in 8-bit, and allow data transfer speed of approximately 2 MB/s. Some of the main differences are that ECP supports Direct Memory Access (DMA) and data compression, which enables higher transfer rates.

I don't know of any LPT ports(parallel printer ports) or parallel ports that
are anything but 8-bits and speeds are given in Megabytes(MB). These IEEE standards are a standard 8-bits. Just as a review/reminder, serial ports are specified in bits-per-second or Megabits/second(Mb)--this is also useful knowledge when you are dealing with understanding LAN data transfers(they're serial).

You may already know this, but I think we all need reminded of these "simple" things from time to time. And it's a good review for me too!

Best of luck in your studies!

PD75

Thanks janmike. So they are both 8 bits.
And the main difference is that ECP uses DMA and data compression.