- Where do you purchase male DIN 8 connectors?
Male DIN 8 connectors are available from Advanced Electronic Support
Products, Inc. (AESP).
- What is the Belden part number for the video cable used by Apple? If
this is not available, what is the cable configuration, and can it be
expanded to 50 feet?
The Macintosh II video cable is custom built for Apple. However,
companies (like Advanced Electronic Support Products) manufacture
cables to client specifications.
Here is the cable configuration. There are four video signals and four
ground pins on the Macintosh II video card DB-15 female connector:
1 RED VIDEO GROUND
2 RED (analog)
3 CSYNC* (TTL) used by Apple Displays
4 CSYNC GROUND
5 GREEN + CSYNC (analog) used for monochrome; CSYNC not
used by Apple displays
6 GREEN CSYNC GROUND
9 BLUE (analog)
12 GREEN + CSYNC (analog) not used
13 BLUE VIDEO GROUND
*Composite sync (vertical and horizontal).
A custom video extension cable for a Macintosh II requires a cable with a
75-ohm impedance value (usually RG59U standard coaxial video cable).
Each line ties to the appropriate pin at the connector, and the shield is
connected to the signal ground pin.
Impedance: 75 ohm
Signal Strength: 13.33 amps, 1 volt
The video signal can be extended 1,000 feet (although there is some color
loss at this distance). The signal should be reliable up to 50 feet.
The distance is limited by the loss of signal strength through cable
resistance.
For more information on pin-outs, cable wiring, and technical
specifications, search on "Macintosh II Video Signals".
- Who manufactures the edge connectors--the connector that goes out
the back of the Macintosh II, not the motherboard connector--for the
NuBus cards?
A source for the video connectors (Part Number:745782-6) is AMP, Inc., of
Southeastern, PA.