Ok, setting said bit to 0 (it's marked as IPT_SPECIAL, so making it active high does the trick) makes unibios list it as MV-1x. Do you know if unibios will detect AES or not?
Edit: answered my own question. Setting bits 3 and 4 of IN3 (0x320000) low, allows unibios to detect an AES.
NICE
Tested some games with neo-po and neo-epo working fine.
Found one exception: kof2000 (kof2000n behaves likewise) - A warning screen appears saying COPYIING blah blah; game stops here.
Edit: sengoku3 and nitd (nitd is MVS only) also have this kind of protection.
I found a solution to get passed this check:
#define STANDARD_IN2
change
PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_UNKNOWN )
to
PORT_BIT( 0x8000, IP_ACTIVE_HIGH, IPT_UNKNOWN )
Together with your findings this gives full AES mode.
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