rde@ukc.ac.uk (R.D.Eager) (03/16/89)
I see reviews of various products for fast transfer of files between PCs
using the parallel port. My question is: how do they do this? The PC parallel
port is inherently unidirectional, so are they just using the status lines
for transferring data? I would like to know...I have an application where
I want bidirectional transfer like this.
Before you post a reply quoting the PS/2; yes, I know that the PS/2 has a
real bidirectional parallel port and that this is used for the IBM Data
Migration Facility. I am asking about transfer using a vanilla parallel
port on a PC/XT.....
--
Bob Eager
rde@ukc.UUCP
...!mcvax!ukc!rde
Phone: +44 227 764000 ext 7589fs-info@sbsvax.UUCP (Fachschaft Mathe/Info) (03/20/89)
In article <441@harrier.ukc.ac.uk>, rde@ukc.ac.uk (R.D.Eager) writes: > > I see reviews of various products for fast transfer of files between PCs > using the parallel port. My question is: how do they do this? The PC parallel > port is inherently unidirectional, so are they just using the status lines > for transferring data? I would like to know...I have an application where > I want bidirectional transfer like this. The original PC parallel port had been unidirectional, but fortunately not everybody accepts everything comin' from IBM. Many parallel ports found on graphic cards ARE bidirectional. Others are not. Some time ago i ran into this problem. I wrote a program on my machine that took the parallel port to be bidirectional, and everything worked fine. Then the thing was brought to the dedicated machine, and everything went wrong. But there i found 4 good usable status lines, and with the 8 data pins as a multiplex selection it worked again. So, U see, old murphy now takes the parallel port domain, too : Every parallel port is bidirectional, unless it needs to be Patrick SCHAAF, you reach me as : Fachschaft Mathe/Info Bau 27, Raum 101 Universitaet des Saarlandes Im Stadtwald X400: fs-info@sbsvax.informatik.uni-saarland.dbp.de D-6600 Saarbruecken 11 (preferred) GERMANY (WEST)