Difference between revisions of "84PCE:Ports:003A"
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'''Function:''' Stack Protector Ports | '''Function:''' Stack Protector Ports | ||
| − | This range of ports holds the location of the bottom of the stack. When the 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 breakpoint in z80 mode. | + | This range of ports holds the location of the bottom of the stack. When the 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== | ==Example== | ||
Revision as of 01:19, 26 May 2016
Synopsis
Port Number: 003A-003C
Function: Stack Protector Ports
This range of ports holds the location of the bottom of the stack. When the 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
