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+Most 3D printer electronics include a little bit of storage (512K, 3K, or more) called EEPROM (Electrically Erasable Programmable Read-Only Memory - whew!) that persists when the power is off. Marlin uses the EEPROM to store the printer settings and loads them up the next time the machine powers up.
+
+==== EEPROM GCodes ====
+* [[M500]] Store current settings in EEPROM for the next startup or M501.
+* [[M501]] Read all parameters from EEPROM. (Or, undo changes.)
+* [[M502]] Reset current settings to defaults, as set in <code>Configurations.h</code>. (Follow with M500 to reset the EEPROM too.)
+* [[M503]] Print the current settings – ''Not the settings stored in EEPROM.''
+
+==== Settings Stored in EEPROM ====
+When you do an <code>M503</code> command it prints a report like this, which will differ depending on your [[Marlin Configuration|configured options]]:
+ '''>>>M503 S0'''
+  M92 X80.00 Y80.00 Z4000.00 E1258.14
+  M203 X500.00 Y500.00 Z2.25 E45.00
+  M201 X9000 Y9000 Z100 E300
+  M204 P1500.00 R1500.00 T3000.00
+  M205 S0.00 T0.00 B20000 X20.00 Z0.40 E5.00
+  M206 X0.00 Y0.00 Z0.00
+  M145 M0 H180 B70 F0
+  M145 M1 H240 B110 F0
+  M301 P20.83 I1.04 D104.71 C1.00
+
+If you haven't changed these settings, then they correspond to the contents of the EEPROM.