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Texas Instruments 99/4A - Page 20

Texas Instruments 99/4A
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The
TMS
991V
sound
generator
is
a
one
chip
device
capable
of
generating
3
tones
and
noise
programmable
by
the
user.
The
keyboard
interface
is
using
the
THS
9901
I/O
chip.
The
keyboard
scanning
is
using
the
multiplexing
technique.
The
I/O
port
provides
the
capability
to
the
99/4
to
access
the
ROM
in
the
various
peripherals
containing
the
device
service
routines
(DSFOs)
and
it
takes
care
of
the
data
exchange.
The
audio
board
houses
an
audio
amplifier
to
drive
the
8
ohm
in
the
European
version
of
the
99/4.
Volume
control
is
by
a
slide
pot
.
12

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