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NO SOUND
[ ] 7.Turn power on and select SWITCH TEST from the
Game Checkup category. Use the right flipper button.
[] 8.Start the test by pressing the CREDIT button.
[] 9.lf no switches are stuck or closed, the game displays
the words ALL SWITCHES OPEN. If the game displays the
words ALL SWITCHES OPEN, the game is ready to play. If
a switch name is displayed, contact your authorized Bally
distributor.
INTRODUCTION
The A
TLANTIS
Sound Board provides the game with
music, sound effects and speech. The board is a microcom-
puter based on a Motorola 68B09E microprocessor (U8).
The board has its own, eight megahertz clock. On-board
RAM and ROM chips store sound data and support
microprocessor operations. Besides the basic computer,
the board includes both a Yamaha synthesizer and a
speech generator.
A 68B21 PIA chip (U12) accepts sound calls from the Con-
trol Board. The PIA also handles communications between
microprocessor U8 and the 1408 DAC.
Three DACs output analog signals to the Sound Board's
two power amplifiers. One of these DACs is known as a
CVSD ...
The 55516 type CVSD
(U6, Continuously Variable Slope
Delta)
modulator recreates
ATLANTIS
speech. The
analog output appears at the sound preamplifier.
The Yamaha synthesizer includes its own DAC
(Digital-to-
Analog Converter)
at chip U1. This DAC mostly outputs
music to the Sound Board's type 1458 preamplifier.
The Sound Board employs its 1408 DAC (U11) for sound ef-
fects. This chip accepts binary input from PIA U12. The
DAC then produces analog voltages employed by the
sound preamplifier.
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