Re: [stella] Games using unofficial opcodes

Subject: Re: [stella] Games using unofficial opcodes
From: "Dennis Debro" <dennis@xxxxxxxxxxxxxxx>
Date: Wed, 1 Jun 2005 11:10:01 -0400
Hi there,

I've been curious about this too. I hadn't run across any in the games
I've disassembled.

> I think AirLock (by Data Age?) used one...

I looked at this and I think it uses one by accident. It does a jmp to
LF01F which would cause the sax (opcode $83) instruction to be called.
They could have jmp'd to LF021 (which is the Veritcal Sync routine) which
would have bypassed this and the game would have worked the same.

Take care,

Archives (includes files) at
Unsub & more at

Current Thread