84PCE:Ports:003A
From WikiTI
Synopsis
Port Number: 003A-003C
Function: Stack Protector Ports
This range of ports holds the location of the bottom of the stack. When the default address D19881 is written to, a non-maskable interrupt is generated which resets the calculator, clearing all of RAM. This could potentially have uses such as a hardware write breakpoint in z80 mode.
Example
Since the stack protector is extremely simple, this equally simple program will cause a crash.
ld (0D19881h),a ret
