Normally, you send either one or two stop bits.
(See
figure 8-4.)
The
transmission of the
start
bit
is independent of the contents of this register. One
start
bit
is automatically generated before the first bit (bit
0)
of the
data
is sent.
Writing this register starts the
data
transmission.
If
this register is written with all
zeros,
no
data
transmission is initiated.
Audio
Output
Connections
The
Amiga has two different forms of audio
output
for the audio channels:
o Stereo
output
jacks
A pair of "RCA" jacks, designed to
be
connected
to
a stereo amplifier.
o RF-Audio
The
channel
3/4
RF modulator will provide sound through the speaker of your
television set when the television is used to provide the computer's display.
Both channels of audio are provided
at
this connector. However, the RF modu-
lator on initial shipments of Amiga computers combines the signals and
transmits monaural sound.
Display
Output
Connections
A 23-pin connector on the back of the Amiga contains signals for two different types of
video output. A separate cable assembly will be made up for each different type of
video.
The
types are listed below.
o RGB Monitors ("analog RGB"). Provides four outputs, specifically red (R),
green (G), blue
(B),
and sync. They can generate up to 4,096 different colors
on-screen simultaneously using the circuitry presently available on the Amiga.
o Digital RGB Monitors. Provides four outputs, distinct from those shown above,
named red (R), green (G), blue
(B),
half-intensity (I), and sync. All
output
levels
are logic levels
(0
or 1). These outputs allow up
to
15
possible color combina-
tions, where the values 0000 and
0001
map to the same
output
value. (Half
intensity with no color present is the same as full intensity, no color.)
Interface Hardware
245
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