Alien Storm (bootleg, set 2)

EMU Infos
dumper	f205v, Caius
date	18/04/2006
emulator	MAME 0.119u1
dev	David Haywood

PCB Infos
name	astormb2 on Arcade Database
description	Alien Storm (bootleg, set 2)
year	1990
manufacturer

Technical references

CPUs

QTY	Type	clock	position	function
1x	MC68000P10	12MHz (24MHz/2)	main PCB	16/32-bit Microprocessor - main
1x	Z8400BB1-Z80BCPU	4MHz (8MHz/2)	main PCB	8-bit Microprocessor - sound
1x	OKI M6295	1MHz, PIN 7 HIGH	main PCB	4-Channel Mixing ADCPM Voice Synthesis LSI - sound
1x	LM324N		main PCB	Quad Operational Amplifier - sound
1x	TDA2002		main PCB	Audio Amplifier - sound
1x	oscillator	24.000MHz	main PCB close to main CPU
1x	oscillator	8.000MHz	main PCB close to sound CPU

ROMs

QTY	Type	position	status
9x	M27C512	1,2,3,4,5,6,7,8,10 main PCB	dumped
1x	TMS27C256	9 main PCB	dumped
21x	NMQ27C010Q	11-31 main PCB	dumped
6x	NMQ27C010Q	32-37 ROMs PCB	dumped
1x	N82S123N	ROMs PCB	dumped
1x	N82S129N	ROMs PCB	dumped

RAMs

QTY	Type	position
2x	UM6264-12L	main PCB
1x	MS6516L-10PC	main PCB
2x	MS6516L-10PC	ROMs PCB
10x	UM6116K-35	ROMs PCB
2x	TMS62256-12NW	ROMs PCB

PLDs

QTY	Type	position	status
1x	GAL16V8S-20HB1	PAL1 main PCB	read protected, extracted
1x	GAL16V8S-20HB1	PAL2 ROMs PCB	read protected, extracted
1x	GAL16V8S-20HB1	PAL3 ROMs PCB	read protected, not extracted

Others

1x 28x2 JAMMA edge connector
1x 12 legs connector (legs 2-5 are marked LE RI UP DO, legs 7-10 are marked SER SPE ROL ATT)
1x trimmer (volume)
2x 8x2 switches DIP

Notes

update 20170604: added pics, better description, confirmed redump

update 20170615 from Caius:
As stated in source, sound hardware is totally different from the original Sega System 18.Bootlegers used a single OKI MSM6295 PCM chip for both samples (stored on two device) and BGM (stored in four devices).Pin 7 of the OKI is high (tied to VCC). Clock on pin 5 of the OKI is @ 1 MHz. H-SYNC should be around 14.84 KHz but I'm not really sure, I can see board has some SYNC issue maybe due bad design.V-SYNC is measured @ 58.271 Hz (using an EL4583 SYNC separator with low-pass filter applied). Back to sound: it seems BGM is missing a track (at least music of first level).You can notice it by ourselves looking at this video I made and comparing it to a MAME or original PCB recording: https://www.youtube.com/watch?v=ZUOEtbNiTNk&feature=youtu.be I can't see any faults on PCB so I think this is a limit of the re-engineered sound hardware (like it happens for some CPS1 bootlegs). Maybe we can ascertain this if sound will be hooked up in emulation (currently it's missing). Lastly : there are three PLDs on PCB (one on CPU board, two on video board).All three are secured GAL16V8 and two of them are registered too. I was able to reproduce only two: a combinatorial and a registered with simple logic.The third is a registered one which use a strong feedback.