Re: 6502 illegal opcodes questions

[heuser.marcus@freenet.de]

> The VIC or SID are about 3 times bigger than the 6502. But ofcourse the
> 6502 is ingenious :)

That's why I wrote "advanced CPUs" ;-)

> the only bad thing about it is, that they wasted transistor space for
> something like BCD mode. I would have preferred some small extra
> commands like ADD without carry or TXY.

I guess, all of us have some wishes for design changes and I agree with
your propositions (though I would've called it TYX - sounds better).

Additionally I would've dumped the indexed-indirect addressing mode and
simply made an indirect-indexed-mode with the X register. IMHO this
would've been infinitely more useful.

For a long time I wished for a block move instruction but I've already
seen too many cases of non-contiguous blocks. A block fill on the other
hand...

bye
Marcus