Notes:Super Mario All-Stars

SMB3 debug mode
It is possible to activate the original SMB3 debug mode (left over from the NES version) by writing to --an uninitialized part of the stack. The original NES version sets this to when you start the game, but the SMAS version does not do this! Due to the unpredictable state of RAM when the console is powered on, one could get lucky and wind up with a value of at that address, thus enabling debug mode.

While this would seem like a 1 in 256 chance each time the system is turned on, the RAM seems to usually settle into certain defaults when powerered up, which varies between individual SNES units. Some systems will reliably write to, which gives the appearance of a debug mode enabled cartridge. This has resulted in numerous reports over the years that an "early batch" of SMAS cartridges were produced that had the debug mode enabled by default.