Add note about fuse settings.

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@@ -6,4 +6,26 @@ This wiki will collect technical notes, assembly and configuration guides, tips
 
 [Classic Keyboard build guide](classic-keyboard-build)
 
-[Apple II notes] (apple-ii-mount)
+[Apple II notes] (apple-ii-mount)
+
+<details>
+<summary>Programming the Atmega chips</summary>
+The fuse settings I recommend are:
+
+Extended: 0xFF
+High: 0xD9
+Low: 0xD2
+
+This corresponds to the following fuse settings
+
+For ATMega328P:
+- Brownout Detection Disabled (Extended byte)
+- SPIEN (in system programming over SPI) Enabled (High byte)
+- Boot flash size 2048 ((high byte)
+- 8 MHz internal RC clock, 4.1 ms startup time (low byte)
+All other fuses disabled.
+
+For ATMega2560: (to do)
+
+Specifically, you want to make sure that the DIV8 flag is OFF (or the chip will run at 1 MHz and you will find the encoder to be very sluggish), and the ISP programming flag is enabled (if you want to be able to program via the ISP header)
+</details>