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- Path: sparky!uunet!gatech!destroyer!cs.ubc.ca!unixg.ubc.ca!ochealth
- From: ochealth@unixg.ubc.ca (ochealth)
- Newsgroups: comp.os.os2.misc,comp.sys.ibm.pc.hardware,comp.os.msdos.misc
- Subject: Re: Question about Parallel Port, please read
- Date: 28 Dec 1992 07:45:06 GMT
- Organization: University of British Columbia, Vancouver, B.C., Canada
- Lines: 31
- Message-ID: <1hmba2INN7jk@iskut.ucs.ubc.ca>
- References: <RiscwB1w165w@tcscs.UUCP> <4825@cruzio.santa-cruz.ca.us> <BzxDM2.L4z@mccc.edu>
- NNTP-Posting-Host: unixg.ubc.ca
-
- In article <BzxDM2.L4z@mccc.edu> pjh@mccc.edu (Pete Holsberg) writes:
- >Speaking of parallel ports, the one on the multifunction card I just got
- >has a jumper for "TRUELY BI-DIRECTIONAL" operation where the
- >"...direction is controlled by printer 'CONTROL' register as follows:
- > bit 5 of CONTROl register
- > 1 input
- > 2 output"
- >
-
- how can bit 5 have a value of 2?
- Do you mean bits 5 and 6?
-
- >If I set the jumper for bidirectional operation, am I depending on the
- >printer electronics to set that bit correctly? Do all printers do it
- >correctly?
- >
-
- There are three ports that control the printer port:
- for lpt1, there is port 378h (data) and 379h and 37Ah for other stuff.
- Since bit 5 is assigned at 379, and bit 5 isn't used for 37A, I guess
- the control bit is at port address 37A.
-
-
- >Thanks and happy holidays.
-
-
- --
- ______________________________________________________________________________
- ochealth@unixg.ubc.ca
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