Editing Parallel port (section)

==Pinouts==
The older parallel printer ports had an 8-bit data bus and four pins for control output (Strobe, Linefeed, Initialize, and Select In), and five more for control input (ACK, Busy, Select, Error, and Paper Out). Its data transfer speed is at 150 kB/s.<ref name="James">James, Kevin. ''PC interfacing and data acquisition : techniques for measurement, instrumentation and control''. Oxford; Boston : Newnes, 2000. {{ISBN|9780750646246}}. p. 256</ref> It is possible for a parallel port to have a speed of 300 KB/s.<ref>{{cite book | url=https://books.google.com/books?id=kG8LcWfruOAC&dq=parallel+port++speed+300+kb/s&pg=PA675 | title=PC Hardware in a Nutshell: A Desktop Quick Reference | isbn=978-0-596-55234-3 | last1=Thompson | first1=Robert Bruce | last2=Thompson | first2=Barbara Fritchman | date=24 July 2003 | publisher="O'Reilly Media, Inc." }}</ref>

The newer EPPs (Enhanced Parallel Ports) have an 8-bit data bus, and the same control pins as the normal parallel printer port. Newer ports reach speeds of up to 2 MB/s.<ref>[http://www.techopedia.com/definition/3658/parallel-port Parallel Port Definition] {{webarchive|url=https://web.archive.org/web/20130103055347/http://www.techopedia.com/definition/3658/parallel-port |date=2013-01-03 }}, Techopedia</ref>{{better source needed|date=February 2019}}

[[Pinout]]s for parallel port connectors are:
[[File:Parallel port pinouts.svg|thumb|350px|[[Pinout]]s for parallel port connectors.]]
{| class="wikitable"
|-
! Pin No (DB25)
! Pin No (36 pin)
! Signal name 
! Direction
! Register - bit
! Inverted
|-
| 1 
| 1
| Strobe 
| In/out
| Control-0
| Yes
|-
| 2
| 2
| Data0
| Out
| Data-0 
| No
|-
| 3
| 3
| Data1
| Out
|Data-1 
|No
|-
| 4
| 4
| Data2
| Out
|Data-2 
|No
|-
| 5
| 5
| Data3
| Out
|Data-3 
|No
|-
| 6
| 6
| Data4
| Out
|Data-4 
|No
|-
| 7
| 7
| Data5
| Out
|Data-5 
|No
|-
| 8
| 8
| Data6
| Out
|Data-6 
|No
|-
| 9
| 9
| Data7
| Out
| Data-7 
| No
|-
| 10
| 10
| Ack 
| In
| Status-6
| No
|-
| 11
| 11
| Busy 
| In
| Status-7
| Yes
|-
| 12
| 12
| Paper-Out 
| In
| Status-5
| No
|-
| 13
| 13
| Select 
| In
| Status-4
| No
|-
| 14
| 14
| Linefeed 
| In/out
| Control-1
| Yes
|-
| 15
| 32
| Error 
| In
| Status-3
| No
|-
| 16
| 31
| Reset
| In/out
| Control-2
| No
|-
| 17
| 36
| Select-Printer 
| In/out
| Control-3
| Yes
|-
| 18-25
| 19-30,33,17,16
| Ground 
| -
| -
| -
|}
Inverted lines are true on logic low. If they are not inverted, then logic high is true.

Pin 25 on the DB25 connector might not be connected to ground on modern computers.{{Dubious|Pin 25 not connected?|reason=Pin 25 should not be unconnected, this would probably be due to a wiring error only.|date=October 2015}}