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Dreamcast VGA Audio/Video Adapter

DESCRIPTION:
The Dreamcast looks good on a Television with Composite Inputs (Composite or S-Video), but even much better on a VGA Computer Monitor. Here is a small device that everyone should have if you own a Dreamcast - It is a simple adapter which allows the RGB Signals to be displayed on your Computer RGB Monitor. The figure below shows the complete schematic. You don't need to be a rocket scientist to finish this project, but some basic understanding of electronics and soldering skills will help tremendously.



PARTS NEEDED:
  • (1) Small breadboard PCB (1.5" x 2")
  • (1) Octal Buffer/Line Driver IC 74240 or 74S240
  • (2) 10K Ohm Resistors
  • (2) 1N4148 or 1N914 Diodes
  • (1) 0.1uF Ceramic Capacitor
  • (3) 100uF/16V Electrolytic Capacitors
  • (1) RGB (Scart) Cable from Naki
  • (1) Right Angle PCB mount High-Density 15-pin VGA Female Connector (To VGA Monitor)
  • (1) Right Angle PCB mount S-Video 4-pin Mini-DIN Female Connector (To TV S-Video)
  • (2) Right Angle PCB mount RCA Jacks (To TV Left/Right Audio)


























































VGA Pin Signal Dreamcast Pin
1 Red Input 16 (via a 100uF/16V Capacitor)
2 Green Input 15 (via a 100uF/16V Capacitor)
3 Blue Input 14 (via a 100uF/16V Capacitor)
4 Monitor ID 2 -
5 Ground -
6 Ground (Red) Metal Shield
7 Ground (Green) Metal Shield
8 Ground (Blue) Metal Shield
9 - -
10 Ground (Sync) Metal Shield
11 Monitor ID 0 -
12 Monitor ID 1 -
13 Horz. Sync 74240 Pin 12
14 Vert. Sync 74240 Pin 16
15 Reserved (Monitor ID 3) -

Note : Connect both RGB Out Select (DC Pin 7) and 31.5 kHz Select (DC Pin 6) to Ground. Finally use a Digital Multimeter to ensure that Vcc (+5V) is not "shorted" to Ground. I will NOT be responsible for any possible damages to your Monitor or System.


S-Video Pin Signal Signal level Dreamcast Pin
1 Ground (Lum) - Metal Shield
2 Ground (Chrom) - Metal Shield
3 Luminance 1V including sync 11 (via a 220uF/10V Capacitor)
4 Chrominance 0.3V burst 12 (via a 1uF/50V Capacitor)

SCART Pin Signal Signal level Dreamcast Pin
1 Audio Output B (Right) 0.5V rms -
2 Audio Input B (Right) 0.5V rms 2
3 Audio Output A (Left) 0.5V rms -
4 Ground (Audio) - 1
5 Ground (Blue) - Metal Shield
6 Audio Input A (Left) 0.5V rms 3
7 Blue Input 0.7V 14
8 Function Select (AV Control) High (9.5-12V) - AV Mode
Mid (5-8V) - Wide-Screen
Low (0-2V) - TV mode		 4
(via a 10K pull-up Resistor )
9 Ground (Green) - Metal Shield
10 Comms Data 2 - -
11 Green Input 0.7V 15
12 Comms Data 1 - -
13 Ground (Red) - Metal Shield
14 Ground (Blanking) - -
15 Red Input 0.7V 16
16 RGB Switching control High (1-3V) - RGB
Low (0-0.4V) - Composite		 5
(via a 75 Ohm pull-up Resistor )
17 Ground (Video Input & Output) - Metal Shield
18 Ground (RGB Switching Control) - Metal Shield
19 Video Output (Composite) 1V including sync -
20 Video Input (composite) 1V including sync 10
21 Common Ground (Shield) - Metal Shield

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