03083: aliensec, baraduke: Baraduke speech

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
03083	Sound	Minor	Have not tried	Mar 31, 2009, 17:32	Mar 31, 2009, 18:20

Tester	sxevious	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS
Status [?]	Acknowledged			Driver	namco/baraduke.cpp
Version	0.130u2	Fixed in Version		Build
		Fixed in Git Commit		Github Pull Request #

Summary	03083: aliensec, baraduke: Baraduke speech
Description	The "I'm your friend" speech at the start of a game is currently handled via a kludge for reads to MCU address 0x1105.
Steps To Reproduce
Additional Information	After some study of the MCU code it appears this location is a DMA sample counter indicating how many 4-bit samples have been transferred so it is likely a feature of the sound chip for each channel (offset 5 = DMA counter). Baraduke seems to use this to indicate when 32 4-bit samples (16 bytes) have been transferred in order to send the next chunk of data from ROM to sample waveform RAM at 0x1040. The MCU code at 0x8495 does the channel setup and the code at 0x84EE does the sample playback. There are two samples in ROM, one at 0x8538 (I'm your friend) and the other at 0x8CD9 (a growl sound) both end with 0xB1. For both sounds channels 0-3 are setup with values 0E 40 18 9A (left volume=E, waveform select=4, frequency=189A (6298Hz), right volume=0) Note none of the other games which use this sound chip (Metro-Cross, Sky Kid, Dragon Buster, Pac-Land, NS86 games or NS1 games) seem to use this functionality. Attached is the "I'm your friend" speech, extracted from the 63701 MCU ROM and converted to 8-bit mono PCM at 6298Hz which is how it should sound.
Github Commit

Flags
Regression Version
Affected Sets / Systems	aliensec, baraduke

Attached Files	B1.wav (3,948 bytes) Mar 31, 2009, 17:32
Attached Files	B2.wav (5,196 bytes) Mar 31, 2009, 17:34