Editing JetDirect (section)

===MIO===

MIO (Modular Input/Output) was the first technology developed by HP for its laser printers to enable the addition of peripheral cards such as JetDirect.

{| class="wikitable"
! Model number !! Network ports !! Released !! Notes
|-
|C2059A
| [[Ethernet]] [[Attachment Unit Interface]] (AUI), [[10BASE2]]
| October 1, 1991
| [[IPX/SPX]] only, discontinued
|-
|C2059B
| Ethernet AUI, 10BASE2
| October 1, 1991
| DLC/LLC only, discontinued
|-
|C2059C
| [[Token Ring]] [[DE-9 connector]]
| October 1, 1991
| IPX/SPX only, discontinued
|-
|C2059D
| Token Ring DE-9 connector
| October 1, 1991
| DLC/LLC only, discontinued
|-
|C2059E
| Ethernet AUI, 10BASE2
| October 1, 1991
| [[EtherTalk]] only, discontinued
|-
|C2059T
| Ethernet AUI, 10BASE2
| October 1, 1991
| [[TCP/IP]] only, discontinued
|-
|J2337A
| [[10BASE-T]], 10BASE2
| November 1, 1992
| IPX/SPX only, Can be upgraded with J2546B SIMM, discontinued
|-
|J2338A
| 10BASE-T, 10BASE2
| November 1, 1992
| DLC/LLC only, Can be upgraded with J2546B SIMM, discontinued
|-
|J2339A
| 10BASE-T, 10BASE2
| November 1, 1992
| EtherTalk only, Can be upgraded with J2546B SIMM, discontinued
|-
|J2340A
| 10BASE-T, 10BASE2
| November 1, 1992
|| TCP/IP only, Can be upgraded with J2546B SIMM, discontinued
|-
|J2371A
| 10BASE-T
| April 1, 1993
|| Can be upgraded with J2546B SIMM, discontinued
|-
|J2372A
| 10BASE-T, 10BASE2, [[LocalTalk]]
| April 1, 1993
| Can be upgraded with J2546B SIMM, discontinued
|-
|J2373A
| Token Ring DE-9 connector
| April 1, 1993
|| Can be upgraded with J2549B SIMM, discontinued
|-
|J2550A/B
| 10BASE-T
| May 1994, November 1, 1996
| "A" version can be upgraded to "B" version with a firmware update, discontinued [[File:HP jetdirect j2550.jpg|right|100px]]
|-
|J2552A/B
|| 10BASE-T, 10BASE2, and LocalTalk
|| May 1994, November 1, 1996
|| "A" version can be upgraded to "B" version with a firmware update, discontinued
|-
|J2555A/B
| [[Token Ring]] DE-9 connector, 8-pin modular
| November 1, 1996
| "A" version can be upgraded to "B" version with a firmware update, discontinued [[File:Jetdirect-J2555B.jpg|right|100px]]
|-
|J2556B
| 10/100BASE-TX
| June 1, 1997
| Flash upgradeable, discontinued
|-
|J4100A
| 10/100BASE-TX, 10BASE2
| February 1, 2000
| Also known as the HP JetDirect 400n Print Server for Fast Ethernet, flash upgradeable, discontinued but not considered a legacy part in regards to firmware development
|-
|J4105A
| Token Ring
| February 1, 2000
| Also known as the HP JetDirect 400n Print Server for Token Ring, flash upgradeable, discontinued but not considered a legacy part in regards to firmware development
|-
|J4106A
||10BASE-T
| February 1, 2000
| Also known as the HP JetDirect 400n Print Server for Ethernet, flash upgradeable, discontinued but not considered a legacy part in regards to firmware development
|-
|}