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+++ b/docs/feature_ps2_mouse.md
@@ -6,6 +6,24 @@ To hook up a Trackpoint, you need to obtain a Trackpoint module (i.e. harvest fr
There are three available modes for hooking up PS/2 devices: USART (best), interrupts (better) or busywait (not recommended).
+### The Cirtuitry between Trackpoint and Controller
+
+To get the things working, a 4.7K drag is needed between the two lines DATA and CLK and the line 5+.
+
+```
+
+ DATA ----------+--------- PIN
+ |
+ 4.7K
+ |
+MODULE 5+ --------+--+--------- PWR CONTROLLER
+ |
+ 4.7K
+ |
+ CLK ------+------------ PIN
+```
+
+
### Busywait Version
Note: This is not recommended, you may encounter jerky movement or unsent inputs. Please use interrupt or USART version if possible.