Lines Matching +full:machine +full:- +full:mode
1 .. SPDX-License-Identifier: GPL-2.0
14 -----------------
17 This device interface allows a point-to-point connection between two
25 printer port. PLIP is a non-standard, but [can use] uses the standard
26 LapLink null-printer cable [can also work in turbo mode, with a PLIP
62 -------------------
77 On these machines, the PLIP driver can be used in IRQ-less mode, where
79 and if such data is available, process it. This mode is less efficient than
80 the IRQ mode, because the driver has to check the parallel port many times
82 indicate that there isn't a noticeable performance drop when using IRQ-less
83 mode as compared to IRQ mode as far as the data transfer speed is involved.
84 There is a performance drop on the machine hosting the driver.
86 When the PLIP driver is used in IRQ mode, the timeout used for triggering a
92 When in IRQ-less mode, the PLIP driver polls the parallel port HZ times
99 10^6/HZ usecs. If both sides of a PLIP connection are used in IRQ-less mode,
104 in which case a long timeout would stall the machine when, for whatever
108 of the net-tools package (its location can be found in the
114 -----------------------------
122 bi-directional parallel ports, rather than output-only ``printer``
123 ports. This allows byte-wide transfers and avoids reconstructing
126 Parallel Transfer Mode 0 Cable
129 The cable for the first transfer mode is a standard
131 data bit outputs of the first port (machine T) connected to the
132 status bit inputs of the second port (machine R). There are five
139 two DB-25 male connectors symmetrically connected as follows::
142 D0->ERROR 2 - 15 15 - 2
143 D1->SLCT 3 - 13 13 - 3
144 D2->PAPOUT 4 - 12 12 - 4
145 D3->ACK 5 - 10 10 - 5
146 D4->BUSY 6 - 11 11 - 6
150 SLCTIN 17 - 17
152 GROUND 25 - 25
157 connected to the metallic DB-25 shell at one end only.
159 Parallel Transfer Mode 1
163 bi-directional parallel ports, rather than output-only ``printer``
164 ports. This allows byte-wide transfers, and avoids reconstructing
166 ``printer`` (as opposed to ``parallel``) ports or when the machine
170 The cable for this transfer mode should be constructed as follows::
172 STROBE->BUSY 1 - 11
173 D0->D0 2 - 2
174 D1->D1 3 - 3
175 D2->D2 4 - 4
176 D3->D3 5 - 5
177 D4->D4 6 - 6
178 D5->D5 7 - 7
179 D6->D6 8 - 8
180 D7->D7 9 - 9
181 INIT -> ACK 16 - 10
182 AUTOFD->PAPOUT 14 - 12
183 SLCT->SLCTIN 13 - 17
184 GND->ERROR 18 - 15
186 GROUND 25 - 25
191 be connected to the metallic DB-25 shell at one end only.
193 PLIP Mode 0 transfer protocol
197 standard in Mode 0. That standard specifies the following protocol::
200 count-low octet
201 count-high octet
210 To start a transfer the transmitting machine outputs a nibble 0x08.
212 machine. The receiving machine disables interrupts and raises its own ACK
217 (OUT is bit 0-4, OUT.j is bit j from OUT. IN likewise)