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From: j@bonnie.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Parallel Port Ethernet Support
Date: 9 Aug 1995 09:43:12 +0200
Organization: Private U**x site, Dresden.
Lines: 58
Message-ID: <409oug$s1p@bonnie.tcd-dresden.de>
References: <807804396.8305@kiss.demon.co.uk> <405geh$18g@helena.MT.net> <4077e8$70o@nntpd.lkg.dec.com>
Reply-To: joerg_wunsch@uriah.heep.sax.de
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Jon Jenkins <jenkinsj@ozy.dec.com> wrote:
> Could you point me at a pin-pin config
>for this Laplink cable. I want to set up my wifes
>486 to use my printer and was wondering how to do this!!
Snippet from /sys/i386/isa/lpt.c:
/*
* Parallel port TCP/IP interfaces added. I looked at the driver from
* MACH but this is a complete rewrite, and btw. incompatible, and it
* should perform better too. I have never run the MACH driver though.
*
* This driver sends two bytes (0x08, 0x00) in front of each packet,
* to allow us to distinguish another format later.
*
* TODO:
* Make Linux/Crynwr compatible mode, use IF_LLC0 to enable.
* Make HDLC/PPP mode, use IF_LLC1 to enable.
*
* Connect the two computers using a Laplink parallel cable to use this
* feature:
*
* +----------------------------------------+
* |A-name A-End B-End Descr. Port/Bit |
* +----------------------------------------+
* |DATA0 2 15 Data 0/0x01 |
* |-ERROR 15 2 1/0x08 |
* +----------------------------------------+
* |DATA1 3 13 Data 0/0x02 |
* |+SLCT 13 3 1/0x10 |
* +----------------------------------------+
* |DATA2 4 12 Data 0/0x04 |
* |+PE 12 4 1/0x20 |
* +----------------------------------------+
* |DATA3 5 10 Strobe 0/0x08 |
* |-ACK 10 5 1/0x40 |
* +----------------------------------------+
* |DATA4 6 11 Data 0/0x10 |
* |BUSY 11 6 1/~0x80 |
* +----------------------------------------+
* |GND 18-25 18-25 GND - |
* +----------------------------------------+
*
* Expect transfer-rates up to 75 kbyte/sec.
*
* If GCC could correctly grok
* register int port asm("edx")
* the code would be cleaner
*
* Poul-Henning Kamp <phk@login.dkuug.dk>
*/
--
cheers, J"org private: joerg_wunsch@uriah.heep.sax.de
http://www.sax.de/~joerg/
Never trust an operating system you don't have sources for. ;-)