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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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