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r21917 Sunday 17th March, 2013 at 21:01:44 UTC by Angelo Salese
Even better explaination, it's nothing special anyway
[src/mame/drivers]namcos2.c

trunk/src/mame/drivers/namcos2.c
r21916r21917
3636
3737    Valkyrie No Densetsu
3838    - gives ADSMISS error on startup
39       Writes 0x0010 -> [0x10fbfc], 0x0000 -> [0x10fbfe], 0x0000 -> [0x10fc00], 0x1234 -> [0x10fc02] at PC=0x3d208, then does some writes to video related
40       devices then it tries to check if [0x10fbfc] is equal to 0x1234 (at PC=0x3d8f8), fails in any case if not.
41       Worth mentioning is that 0x3d202 contains a check with work RAM address 0x10fe5c. If zero the program flow writes 0x1234 on [0x10fbfc] instead.
39       Does a checksum on area 0x181000 - 0x183fff, in 0x20 bytes block chunks. Game doesn't init it properly so you'd have to go into service menu and do
40       an "all data clear" or play once to get rid of the message.
4241
4342    Bubble Trouble (Golly Ghost II)
4443    - no artwork

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