I found this somewhere, thought some of you might not know it (although I doubt it, lol): ===================================== 42S SPEED-UP - To put your HP42S in fast mode: 1. Press EXIT and LOG simultaneously, release the buttons and then press the <- key to enter the monitor. 2. Use +, -, ×, ÷ to move to the address 40300 (seen to the left on the display) 3. Press XEQ to enter F at that position (you can use - to assure yourself of having typed it right) -- $7 is the default speed 4. Move to the address 00000 5. Press . to return to user mode (if you return pressing EXIT the normal speed would be restored) 6. Even if it states "Machine Reset" the memory should be preserved and your HP is now running at double speed. 7. XEQ [desired program] (The HP will be in fast mode until you press the EXIT key (avoid) Note that the higher speed you indicate, more battery consumption. by Erik Ehrling =====================================
How to double the speed on your HP-42S
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