file   : readme.txt
author : rtw
created: 2022-10-17

Alien Front Proto, SEGA/WOW ENTERTAINMENT 2001, NAOMI M2/M3 Prototype Cart

This is an interesting cart. When it was bought it had no EPROM.
rom0.ic22 is a patched version crafted by MetalliC.

The serial number on the stickers on the PCB match the
serial number stored in the secure FLASH.

Cart is populated with 21 FLASH ROMs.

rom11-rom21 are unused on this game but they are not empty.

rom7.ic7s is the same as: rom11.ic11s 
rom19.ic19s is the same as: rom21.ic21s

MetalliC analysed the ROMs and found:

ic1  - same as release
ic2  - almost same, 1bit difference, probably bitrot
ic3  - same as release until offset 0x78000, don't know what the extra data is.
ic4  - same as release
ic5  - same as release
ic6  - same as release
ic7  - same as release
ic8  - same as release
ic9  - almost same, 1bit difference, probably bitrot
ic10 - same as release until offset 0x52000, don't know what the extra data is.
ic11-ic16 - some game data, not populated in release ver
ic17,ic18,ic19,ic21 - probably "empty", filled with random data during flash testing
ic20 - 1MiB of ver 1.2 (rev A) dev.box NAOMI BIOS ROM
       the rest of the 7MiB - random data same as above

Seems like there is some quite strange stuff inside the unused flash parts
"ic11-ic16 - some game data, not populated in release version

The dump has been validated against the ROM TEST checksums.

Cart type      : M2/M3
Game Id        : BCQ0
Protection key : None

Name                            Size     CRC32 
--------------------------------------------------
alien_front_proto_pcb_1.jpg     944329  0x53d89b07
alien_front_proto_pcb_2.jpg     985017  0x7023b663
alien_front_proto_rom_test.jpg  645226  0x62209c88

Name           Size     CRC32       Chip Type
---------------------------------------------
rom0.ic22      4194304  0xb802554f  27C322
rom0_pad.ic22  4194304  0x7d5b6975  28F640
rom1.ic2s      8388608  0x35d2095b  28F640
rom2.ic2s      8388608  0x84561dae  28F640
rom3.ic3s      8388608  0x1349ac72  28F640
rom4.ic4s      8388608  0x0c30bdfb  28F640
rom5.ic5s      8388608  0x11284296  28F640
rom6.ic6s      8388608  0x9b8ebb70  28F640
rom7.ic7s      8388608  0xe87f54b7  28F640
rom8.ic8s      8388608  0xbfbffd3f  28F640
rom9.ic9s      8388608  0xeddc5f4e  28F640
rom10.ic10s    8388608  0x8a7010dc  28F640
rom11.ic11s    8388608  0xe87f54b7  28F640
rom12.ic12s    8388608  0x6e1e84a9  28F640
rom13.ic13s    8388608  0x8d93dd14  28F640
rom14.ic14s    8388608  0x5a0b2481  28F640
rom15.ic15s    8388608  0x23738710  28F640
rom16.ic16s    8388608  0xce1361bf  28F640
rom17.ic17s    8388608  0x89b2b65a  28F640
rom18.ic18s    8388608  0x145501fc  28F640
rom19.ic19s    8388608  0x314fcda4  28F640
rom20.ic20s    8388608  0x60207019  28F640
rom21.ic21s    8388608  0x314fcda4  28F640
sflash.bin         132  0x5e3f74a0  X76F100 serial EEPROM  

supplier: zozo
credits: MetalliC, rtw, zozo
dumper: rtw