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diff --git a/notes.md b/notes.md
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--- a/notes.md
+++ b/notes.md
@@ -166,3 +166,28 @@ Compression is an optional feature introduced in HDMI 2.1 :(
 ----
 
 PIO-based USB needs the system clock to be a multiple of 120mhz
+
+----
+
+https://electronics.stackexchange.com/questions/684221/usb-c-on-off-switch-design-that-is-pd-compatible-off-similar-to-cold-plugging
+
+----
+
+OpenBMC
+
+~$300 price range:
+ - Motherboards with a BMC
+ - Old proprietary IP-KVM
+ - TinyPilot KVM
+ - PiKVM
+~$60 price range:
+ - DIY PiKVM
+ - JetKVM
+~$30 price range
+ - Sipeed NanoKVM
+ - https://github.com/stefanklug/picoKVM (~$20 Arduino, ~$5 HDMI
+   capture), non-IP
+
+----
+
+https://hackaday.com/2022/08/26/bit-banged-ethernet-on-the-raspberry-pi-pico/