We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
SEV
From SnesLab
SEV (SEt Overflow) is a mnemonic for a non-existant 6502 instruction.
To set the overflow flag, consider using SEP or BIT.
A common way is to use BIT on the address of a byte in ROM that has bit 6 set, like an RTS.[1]