Editing SCART (section)

== Japanese RGB 21-pin connector ==
[[File:Dimensia EIA.jpg|thumb|[[EIA interface]] on a 1987 [[RCA Dimensia]]]]
[[File:Japanese SCART Connector Pinout Color.svg|thumb|Alternative Japanese JP21 pinout]]

There is also a Japanese version of the SCART connector, which is referred to as the Japanese RGB-21 connector, EIAJ TTC-003,<ref name="gamesx.com">{{ cite web| url = http://gamesx.com/wiki/doku.php?id=av:japanese_rgb-21|title=av:japanese_rgb-21 [NFG Games + GameSX] | website = gamesx.com }}</ref> or simply JP-21. This version of SCART uses similar signals and the same connector, but it has a different pinout. In Japan and Korea, it is commonly called RGB-21 while it is more generally called JP-21 in the English-speaking world.

JP-21 was standardised in January 1983 with the norm TTC-0003<ref>{{cite web|url=https://www.jstage.jst.go.jp/article/itej1978/38/9/38_9_845/_pdf|title=Television receiver measurement|format=PDF}}</ref> published by [[EIAJ]], which was superseded in March 1993 by the norm CPR-1201<ref>{{Cite web|url=https://www.jeita.or.jp/cgi-bin/standard/search.cgi|title=JEITA 電子情報技術産業協会 /|website=www.jeita.or.jp}}</ref> to include S-Video. CPR-1201 was withdrawn in March 2003 to be replaced by the equivalent norm CPR-1205, representing Japan's transition from analogue to digital, and thus antiquating analogue connectors.

It was adopted in Japan for the connector's ability to support RGB output format (no compression nor deterioration of original video signals) but, contrary to SCART in Europe, it never saw widespread use on the consumer market.

When using RGB video, the red channel uses the same pins in both standards, so red video with no audio is indicative of mismatching JP-21 SCART with EuroSCART.<ref>{{cite web|url=https://www.retrogamingcables.co.uk/euroscart-versus-jp21|title=EuroSCART versus JP21|website=www.retrogamingcables.co.uk}}</ref>

{| class=wikitable
|+ JP21 pinout
! Pin || Function || Pin || Function
|-
| 1 || Audio left channel input || 2 || Audio left channel output
|-
| 3 || Audio ground || 4 || Audio ground
|-
| 5 || Audio right channel input || 6 || Audio right channel output
|-
| 7 || Video ground || 8 || Video ground
|-
| 9 || CVBS input || 10 || CVBS output
|-
| 11 || AV control input || 12 || Ym input
|-
| 13 || Red signal ground || 14 || Ground
|-
| 15 || Red signal I/O || 16 || Ys input
|-
| 17 || Green signal ground || 18 || Blue signal ground
|-
| 19 || Green signal I/O || 20 || Blue signal I/O
|-
| 21 || Plug shield 		
|}

Notes:

* Audio input: 0.40 mVrms, > 47K ohms
* Audio output: 0.40 mVrms, > 10K ohms
* CVBS (composite video) in and out: 1 Vp-p, 75 ohms, sync: negative
* Ym input: Switches RGB to half-brightness, for video overlay (L: < 0.4&nbsp;V, H: > 1&nbsp;V, 75 ohms)
* Ys input: RGB in/out: (ground for output, 1&nbsp;V+ for input (preferred))
* All RGB lines: 0.7 Vp-p, 75 ohms<ref name="gamesx.com"/>