Date   : Fri, 07 Mar 2008 17:54:04 +0000 (GMT)
From   : tommowalker@... (Tom Walker)
Subject: TUBE chip, accessing 'Parasite' side - 16Mhz 65C02S

> Interesting to hear the Zalaga was DESIGNED for illegal opcodes. I wonder 
> why? Perhaps it was used in the anti-copy code to make it very difficult 
> for people to disassemble and work-around.

Illegal opcodes are used in the flipped sprite routine for speed reasons.
They might be used elsewhere, I don't know. Quite a few games used illegal
opcodes for speed.

Tom


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