View source for EIAJ-8

'''EIAJ-8''' (also known as the '''Honda connector''', '''RGB8''', or '''8-pin square connector''' / '''8ピン角型端子''') is a rectangular 8-pin connector standardized by the Electronic Industries Association of Japan (EIAJ). It was commonly used on Japanese monitors, televisions, and VTRs from the 1970s through the 1990s for carrying video and audio signals.

== Overview ==

The EIAJ-8 connector features a distinctive rectangular housing with 8 pins arranged in two rows of four. Unlike round DIN connectors, the rectangular shape provides a more secure connection and prevents accidental disconnection.

The connector was originally developed by Honda Electric for use in video equipment, hence the alternative name "Honda connector." It was later adopted as an EIAJ standard and became common on:

* Professional and consumer monitors (Sony, NEC, Sharp, Sanyo, Victor, Toshiba, Hitachi)
* Video tape recorders (VTRs)
* Computers with TTL-level digital RGB output (Fujitsu, General, NEC, Pioneer, Sharp)

== Signal Types ==

The EIAJ-8 connector can carry different signal types depending on the application:

* '''[[TTL RGB]]''' - TTL-level RGB with separate H-sync and V-sync (8 or 16 colors)
* '''Analog video''' - Composite video with stereo audio (on VTR equipment)

== Common Pinouts ==

=== TTL RGB (Monitor Input) ===

As used on monitors like the Sony Profeel Pro series (confirmed from Sony KV-1311CR manual):

{| class="wikitable"
! Pin !! Signal !! Description
|-
| 1 || I (C CONT.) || Brightness/Intensity control (only 8 colors if N.C.)
|-
| 2 || R || Red input (TTL)
|-
| 3 || G || Green input (TTL)
|-
| 4 || B || Blue input (TTL)
|-
| 5 || GND || Ground
|-
| 6 || N.C. / GND || Not connected or Ground
|-
| 7 || HSync || Horizontal sync (TTL, active low)
|-
| 8 || VSync || Vertical sync (TTL, active low)
|}

== Compatible Equipment ==

=== Monitors with EIAJ-8 Digital RGB Input ===

* Sanyo CMT-145F, CMT-A14F1
* Sharp CU-14F1, CU-14P1
* Sony CPD-14CD1, KV-1311CR, KV-14CP1, KV-14MD1, KX-13CD1, KX-14CP1, KX-14HD1, [[Sony KX-21HV1|KX-21HV1]], KX-27HGB1, [[Sony KX-27HV1|KX-27HV1]]
* Toei FTC-1201, FTC-1208, FTC-1401
* Toshiba 14V20F, 21K692
* Victor AV-M150, AV-M210, AV-M280, AV-M370, AV-MT21
* And many others (NEC, Hitachi, National, Mitsubishi, Logitec)

=== Computers with EIAJ-8 Digital RGB Output ===

* Fujitsu FM-X (uses round 6-pin variant)
* General PCT-55
* Pioneer PX-7, PX-7(HB), PX-V7

== Sourcing ==

Original EIAJ-8 connectors are difficult to find. Sony part numbers include:
* '''1-506-161-00''' - Male 8-pin plug
* '''1-509-113-00''' - Female 8-pin socket

Hirose 1300/1600 series connectors may be compatible, though pin sizes can vary.

== See Also ==

* [[8-pin DIN 45326]] - Round 8-pin DIN connector (different physical form, used for analog RGB)
* [[TTL RGB]] - TTL-level digital RGB signal format
* [[JP21]] - Japanese 21-pin analog RGB connector

== References ==

* [https://www.cameratim.com/electronics/honda-video-connectors/ Honda Video Connectors] - Technical reference
* [https://www.msx.org/wiki/Digital_RGB_connector Digital RGB connector] - MSX Wiki

[[Category:Connector types]]