Re: 6502/6809's rool btw...
EIEIO on the 6502? You jest. It's the PowerPC "Enforce Instruction Execution In Order" opcode. It *might* go back as far as IBM's 801 processor, or more likely the original POWER ISA, but no further. The first time you're liable to have come across this unless you were doing low level AIX development on IBM hardware is when the first PowerPC Macs came out in 1994. About ten years after the 6502 was commonplace.
Biting the hand that feeds IT
