And on the Atari 2600, the fastest way to write to consecutive video registers is to set the stack pointer to its address and do push instructions. You take ad

And on the Atari 2600, the fastest way to write to consecutive video registers is to set the stack pointer to its address and do push instructions. You take advantage of getting the stack pointer decremented for free on each push. The stack pointer can be hijacked for this since the machine has no interrupts. The 2600 can also run self-modifying code in RAM, which I did: http://www.dos486.com/atari/ http://www.dos486.com/atari/