Real ISAs are too complex. SIO assumes one cycle for all instructions, and discards binary, among other affordances. This makes the game more accessible. Also,

Real ISAs are too complex. SIO assumes one cycle for all instructions, and discards binary, among other affordances. This makes the game more accessible. Also, the instruction set is optimized so that you can't do too much in a single instruction, so as to keep the space constraints meaningful. Now, if you were talking about the DCPU-16, I'd agree.