At 09:28 07.10.97 +1000, you wrote:
>At 01:41 PM 10/6/97 -0400, you wrote:
>>On Mon, 6 Oct 1997, Gerard Gerritsen wrote:
>>The i/o lines on the standard parallel port are all unidirectional, so make
>> sure your signal is connected to an input line.  Also, some of the lines
>> have inverted logic (low reads high, high reads low).
>>
>>Steve
>
>Are you sure? I have run FastWire on a 4.77MHz XT. FastWire is one of those
>fast file transfer programs that uses the parallel port to talk between pcs.
>It is definitely bidirectional.
>
>
>Regards,
>
>Ross McKenzie
>Melbourne Australia
>
>to reply by email remove the "nosp*m." text from my email address
>

I would expext that it uses som kind of nibble mode.  I think one
implementation of nibble mode is described in some IEEE1284 document around.
Although some OLD documentation says that it *IS* possible to read the data
lines if they are driven by more than 20mA.  Has anyone actually tried this?
I have done some simple tests, and it semes to work, but I don't think that
the drivers likes to this kind of drive fight.  The port will probably blow
up sooner or later...

Havard