Re: [stella] Emulating on a C64 or Amiga

Subject: Re: [stella] Emulating on a C64 or Amiga
From: Robin Harbron <macbeth@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 02 May 1997 08:21:51 -0400
Greg Miller wrote:

> Well, you also have to consider that an 816 is much faster than a 6502
> at a given
> speed, or does it emulate the cycle times in the compatibility mode?

In the 6502 emulation mode, it runs EXACTLY the same as a 6502, right
down to the cycle timing.  In 8-bit 65816 mode, some of the instructions
execute a cycle or two? faster.

The one difference in emulation mode is that the "illegal" opcodes have
been redefined with new legal opcodes.  This causes some C64 programs
to fail, as they made use of those instructions.  Is this common in
2600 games?

Robin Harbron

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