Time before display dims (Tdim)

[DrDJones]

The "Tdim" variable must be reset between sessions. Once set, it controls the dimming delay time until the next use of the calculator. If the "Tdim" variable is viewed, it always shows the adjusted value, but uses a 30 second delay until reset for current session. Once user changed, I think the "Tdim" value should remain as selected by the user until changed again by the user or until the calculator is reset. Also, if "Tdim" shows a user-selected delay, it should dim using that value. Ex: I set the "Tdim" value to 120000 (3 minutes, since value is in msec). The display dims after 3 minutes following the last key press on the calculator until I turn off the calculator. When I turn on the calculator to use again, "Tdim" is still 120000, but dims in 30 sec, indicating "Tdim" thinks it is 30000.