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HP 48 and 49G Series Calculators - Pausing and Becoming Slow When Entering Numbers or Doing Calculations

Introduction
The most likely reason for the calculator pausing and working slowly when entering numbers or doing calculations is memory related. The calculator temporarily stores all items entered, even after it is turned off. Eventually, the memory becomes full, slowing operations. Halting the system or typing in the MEM command will quickly return the calculator to its full potential. This process is similar to restarting, or cleaning up the memory on the PC by removing temporary files.
Halting the system
Halting the system will accomplish the following:
  • Cancel all system operations
  • Clear the history and the stack
  • Cancel all executing programs and initialize any local variables used in them
  • Turn off the user keyboard
  • Make HOME the current directory
To halt the system, follow these steps:
  1. Press and hold the ON key.
  2. Pressing and holding the F3 key.
  3. Release both keys at the same time.
The display will flash the restart screen.
  note:
This will not affect items that have been stored in permanent memory or programs.
Using the MEM (memory available command)
The MEM command returns the number of bytes of available RAM. Before it can assess the amount of memory available, MEM must remove objects not in use in temporary memory. This clean-up process (called “garbage collection”) occurs automatically at times when memory is full. Since this process will occur automatically and may slow calculator operation at undesired times, it may be desirable to force it to occur at a desired time by executing MEM.
To run a MEM command, do the following:
  1. Type in the following alpha keys.
  2. Press ALPHA twice.
  3. Press M E M.
  4. Press Enter.
The display will show the approximate amount of available memory.

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