Specifications

CHAPTER 2
Hardware Interface
22
ADB Port and Connector
ADB Port and Connector 2
The ADB cable is part of the dual video and ADB cable. This cable transfers ADB
information between the display and the CPU, enabling you to connect ADB devices
directly to the display if you wish. The ADB connector is a standard miniature DIN
(MD-4) connector. It has four signal pins and an outer shield that functions as chassis
ground. Figure 2-3 shows the pin designations for the ADB connector, and Table 2-2 lists
the signal assignments.
Note
This ADB cable is used to transfer control data between the Macintosh
computer and the display. It is not used in PC applications.
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Figure 2-3 ADB connector pin designations
Table 2-2 ADB connector signal assignments
Pin
number Signal name Description
1 ADB Bidirectional data bus for input and output; transfers
audio (AV display only) and video control data between
the CPU and the display
2 POWER ON Enables power to be turned on from the keyboard
3 +5VDC +5 V power
4 GND Logic ground
Outer
shield
None Chassis ground
4 3
2 1
The outer shield is
connected to chassis
ground