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This port only exists as a distinct port on the TI-83 Plus Silver Edition, the TI-84 Plus, and the TI-84 Plus Silver Edition. On the standard TI-83 Plus, it acts as a shadow of port 03.
This port is protected, which means user programs cannot ordinarily write to it directly.


Port Number: 23h

Function: Flash Execution Upper Limit

This port controls the upper of two flash execution limits.

Read Values

  • [00h - FFh]: Flash pages above this value have execution permission. In TIOS this will be set to the last app page minus one.

Write Values

  • [00h - FFh]: The new execution limit. You must enable flash access through port 14 first.


If port 23h is less than 22h, 22h takes precedence; that is, all pages will be executable.

This port can be completely overridden by port 24.

This port does not exist on the standard 83 Plus. See ports 5 and 16 instead. Execution of code from a page at or below this port's value and above the value in port 22 will cause the calculator to reset.