RGB21 connector
This page was last modified 11:59, 31 August 2017 by Gdx. Based on work by Rderooy and Mars2000you and others.

Contents

Description

The RGB21 connector is the same connector that the SCART connector but the pins have a different order. 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.