# SPDX-License-Identifier: GPL-2.0-only
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#
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# Parallel Line Internet Protocol (PLIP) network device configuration
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#
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config PLIP
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tristate "PLIP (parallel port) support"
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depends on PARPORT
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help
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PLIP (Parallel Line Internet Protocol) is used to create a
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reasonably fast mini network consisting of two (or, rarely, more)
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local machines. A PLIP link from a Linux box is a popular means to
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install a Linux distribution on a machine which doesn't have a
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CD-ROM drive (a minimal system has to be transferred with floppies
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first). The kernels on both machines need to have this PLIP option
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enabled for this to work.
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The PLIP driver has two modes, mode 0 and mode 1. The parallel
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ports (the connectors at the computers with 25 holes) are connected
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with "null printer" or "Turbo Laplink" cables which can transmit 4
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bits at a time (mode 0) or with special PLIP cables, to be used on
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bidirectional parallel ports only, which can transmit 8 bits at a
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time (mode 1); you can find the wiring of these cables in
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<file:Documentation/networking/plip.rst>. The cables can be up to
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15m long. Mode 0 works also if one of the machines runs DOS/Windows
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and has some PLIP software installed, e.g. the Crynwr PLIP packet
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driver (<http://oak.oakland.edu/simtel.net/msdos/pktdrvr-pre.html>)
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and winsock or NCSA's telnet.
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If you want to use PLIP, say Y and read the PLIP mini-HOWTO as well
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as the NET-3-HOWTO, both available from
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<http://www.tldp.org/docs.html#howto>. Note that the PLIP
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protocol has been changed and this PLIP driver won't work together
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with the PLIP support in Linux versions 1.0.x. This option enlarges
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your kernel by about 8 KB.
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To compile this driver as a module, choose M here. The module
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will be called plip. If unsure, say Y or M, in case you buy
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a laptop later.
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