This article provides a description of the Apple /// color video port.
DB-15 Connector Signal Ddescription
1 ....Shield Ground - Establishes electrical ground.
2 ........... XRGB4 - One of 4 RGB outputs. Pins 2, 5, 9, & 10 are TTL
outputs with instantaneous color information. A
linear-weighted sum of these four signals will form
a true 16 color RGB video signal.
3 ........... SYNC - Composite negative syncronous signal.
4 ........... PDI - Not used
5 ........... XRGB1 - See pin 2 (one of 4 RGB outputs)
6 ........... GND - Power & Signal Ground
7 ........... -5V - Maximum load 200 mA
8 ........... +12V - Maximum load 500 mA
9 ........... XRGB2 - See pin 2 (one of 4 RGB outputs)
10 ...........XRGB8 - See pin 2 (one of 4 RGB outputs)
11 ...........BWVID - NTSC B&W Composite video with negative
going sync, 1 volt peak to peak into a 75 ohm load.
12 ...........NTSC - NTSC Color video with negative going
sync, 1 volt peak to peak into a 75 ohm load.
13 ...........GND - Power & Signal Ground
14 ...........-12V - Maximum load 200 mA
15 ...........+5V - Maximum load 1 Amp.
Article Change History:
14 Feb 1995 - Reviewed for technical accuracy, revised formatting.
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