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[bloodline]

Karlos wrote:
A few suggestions that I think might be fun

1) Expanding the register width to 64-bit. You'd need to devise a new set of opcodes to support operations on them, however.

I'd mode it out like the x86, with a Long Mode. That way the 68k instruction set and architecture could be stripped of all those performance crippling addressing modes and remove all the dead weight instructions... :-)

2) Saturation arithmetic would be an interesting addition, especially for graphics manipulation.

Hmmm... just add an off the shelf SIMD unit, that can be used in "Long Mode"

3) Allow address registers to be used for normal integer operations. There are times when you only need a few pointers but your code needs extra data registers.

In Long Mode, all registers are equal, and 64bit ;-)

The problem with all of these is finding an efficient way to implement them that preserves backwards compatibility.

Long Mode... :-D