RGB21 connector
This page was last modified 02:41, 27 January 2018 by Mars2000you. Based on work by Gdx and Rderooy and others.

Contents

Description

The RGB21 connector is the same connector that is used for SCART, but the pins have a different meaning. Specifications are also more or less different.

Pinout (RGB and Composite Video)

RGB21 connector


Pin Description Signal level Impedance
1 Audio left/nono channel input 0.4V (rms) 47 kΩ
2 Audio left/nono channel output 0.4V (rms) 10 kΩ
3 Audio channel inputs ground
4 Audio channel outputs ground
5 Audio right channel input (N.C. on MSX) 0.4V (rms) 47 kΩ
6 Audio right channel output (N.C. on MSX) 0.4V (rms) 10 kΩ
7 Video input ground
8 Video output ground
9 CVBS (Composite Video) input 1V (p-p) 75 Ω
10 CVBS (Composite Video) output 1V (p-p) 75 Ω
11 AV control input 3 ~ 5V 22k Ω
12 Ym input (RGB video mask) 1 ~ 3V 75 Ω
13 Red signal ground
14 Ym & Ys ground
15 Red signal (I/O) 0.7 V (p-p) 75 Ω
16 Ys input 0 ~ 0.4V = Composite mode
1.0 ~ 3.0V = RVB mode
75 Ω
17 Green signal ground
18 Blue signal ground
19 Green signal (I/O) 0.7 V (p-p) 75 Ω
20 Blue signal (I/O) 0.7 V (p-p) 75 Ω
21 Plug shield


List of MSXs with RGB21 connector

How to make a RGB21 to SCART cable

Connect the wires as follows.

RGB21 Signal SCART
15 Red signal 15
19 Green signal 11
20 Blue signal 7
10 Sync/Video 20
1 Audio left 6
5 Audio right 2
11 +5V (or better +12V) 8
7, 3, 21, 13, 18 and 17 Corresponding grounds 5, 9, 18, 13, 14 and 17
21 Plug shield 21


It is often necessary to add the following components:

  • A 100~220μF polarized capacitor on each RGB pin of the scart. (Three same capacitors, the + connected on the wire that go to the RGB21 connector)
  • A 100 Ω resistor between the pin 8 of RGB21 and the pin 16 of the SCART.