>> Ludicrously difficult is programming in machine code for a processor that 
>> doesn't yet exist's micro-ops. ;)
>
> If it makes you feel any better...
>
> http://en.wikipedia.org/wiki/6502#Bugs_and_quirks
>
> Note also that the 6502 doesn't have any microcode. It just uses a PLA as 
> the control matrix - much like the processor that I'm designing. ;-)

FWIW when Acorn designed the original ARM processor, one person designed and 
simulated it on a 6502 before starting actual hardware design.  IIRC it only 
took a very small number of people in total (like 5 or 6) to design the 
hardware implementation.

According to wikipedia over 10 billion ARM cores have been built, I bet they 
never imagined that when they were sat at their 6502's designing it back in 
the 80s :-)

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