Played when the UFO ship appears at the top of the screen.
This circuit uses a common and well documented chip. Actually, I have found this exact configuration in a couple of magazines associated to "siren" effects and it is also described in the SN76477 datasheet for a siren, space war or phasor gun sound.
The SN76477 is emulated by MAME and by my own emulator Tickle.
Copyright (c) 2004 Alessandro Scotti. All rights reserved.
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