🚀 go-pugleaf

In article: <+7esqLA4EyE3EwgJ@dunvegan1.demon.co.uk>  Paul Richards 
<Paul@dunvegan1.demon.co.uk> writes:
> 
> Andy writes,
> >Enhanced Parallel Port
> >Standard Parallel Port
> >Extended Capabilities Port
> 
> So what's the best, ECP?
Possibly!.
The original 'parallel port', required processor intervention to do 
anything. It could use a single IRQ, and in OS's like Unix, this 
capability was used to make for less processor overhead on printing. 
the 'EPP', allows the data lines to be operated in a bi-directional 
mode, allowing more sophisticated input from the attached devices. 
This is commonly used by scanners, and to give 'status monitoring' 
for printers. ECP, adds DMA support to allow faster transfer of 
blocks of data without processor overhead. _However_ quite a few 
programs give problems when the port is set to this mode It is quite 
common to find that all sorts of unexplained problems suddenly 
disappear when EPP mode is used. So the answer is that ECP is better, 
_provided_ your system has none of these problems.

Best Wishes

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