POWER CONNECTIONS
The Extended Video Slot provides several different voltages designed
to supply Video devices. The A2000 power supply is currently rated
at 200 Watts, which supplies the main board and all other expansion
ports as well as the Video Slot.
Digita Wideo Ground
These pins provide additional grounding for digital or video based
(GROUND)
devices. Pins
1,
5,
9,
12, 22, and 32.
Audio Ground
CLOCK
SIGNALS
CDAC Clock
/C3 Clock
Timer Time Base
(TBASE)
VIDEO
SlGNALS
Composite Video
These pins provide grounding in common with the separate on-
board audio ground. Pins
34,36.
These are various clock signals useful for synchronous timing of vid-
eo peripherals.
For NTSC, this is a 7.1
6
MHz clock that leads the 7.1
6
MHz system
clock by about 70ns
(90
degrees). Pin
15.
For a PAL system, this
is
7.09
MHz.
For NTSC, this
is
a 3.58 MHz clock that's synched to the rising edge
of the 7.1
6
MHz system clock. Also known as
/CCKQ
in some places.
Pin 17. For a PAL system, this
is
3.55
MHz.
This
is
the real time clock time-base input, either 50Hz or 60Hz, de-
pending on the country involved and the setting of the Time Base
Jumper. The jumper can select either line frequency or vertical syn-
chronization as the clock's time base. Pin
14.
The main point of this slot
is
access to more of the video signals gen-
erated by the Amiga's custom video chips. Most of the signals avail-
able here aren't available on any external port.
This
is
the analog level monochrome Composite Video signal also
available on the Composite Video jack of the
B2000. Pin 13.
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