Alien Storm (bootleg, set 2)

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EMU Infos
dumper f205v, Caius
date 18/04/2006
emulator MAME 0.119u1
dev David Haywood
PCB Infos
name astormb2 on ProgettoEMMA
astormb2 on Arcade Database
description Alien Storm (bootleg, set 2)
year 1990


Technical references


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


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


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


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


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


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: 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.



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