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- Newsgroups: comp.unix.bsd
- Path: sparky!uunet!boulder!ucsu!rintintin.Colorado.EDU!galbrait
- From: galbrait@rintintin.Colorado.EDU (GALBRAITH JOHN)
- Subject: Re: reading from parallel port
- Message-ID: <1993Jan26.025455.7032@ucsu.Colorado.EDU>
- Sender: news@ucsu.Colorado.EDU (USENET News System)
- Nntp-Posting-Host: rintintin.colorado.edu
- Organization: University of Colorado, Boulder
- References: <1jhejv$9l3@Germany.EU.net> <C1ADIM.1s3@sleeper.apana.org.au>
- Date: Tue, 26 Jan 1993 02:54:55 GMT
- Lines: 29
-
- In article <C1ADIM.1s3@sleeper.apana.org.au> raz@sleeper.apana.org.au (Roland Turner) writes:
- >bs@Germany.EU.net (Bernard Steiner) writes:
- >
- >>Folks,
- >>I just read through one of those terrible x86 magazines. Somebody advertized
- >>their LPT port ethernet[TM] adapter.
- >
- >>While I believe that the idea of driving the ethernet through a slow LPT
- >>port is not really fascinating, I sort of like the idea of using the
- >>parallel port for "serious work". This would require reading from the
- >>port, though.
- >
-
- I have built some hardware that read from the parallel port. The problem
- is that the main data lines are output only. You can read from the port,
- but it returns the last value that you wrote, not what is currently
- what you may have put on the port.
- I did get it to work (I was building a MIDI port for a lab). What
- I did was to use four control lines from one of the ports that CAN be read
- and read a nibble at a time. It worked, and was fine for MIDI (A serial
- interface) but I would imagine that it would be SLOW for an ethernet card.
-
- Also, it could be that some newer lpt cards do have bidirectionality. I
- think the MCA cards do for instance, but I may be wrong.
-
- john galbraith
- galbrait@rintintin.colorado.edu
-
-
-