By the way, I just ordered a replacement battery for mine. I ordered this with a JST 2.0 MM connector. The polarity was reversed when I got it, but easy fix with a small screwdriver to pop out the leads. Got the battery today, so far so good. And pretty cheap! https://bihuade.com/products/1pcs-lot-good-qu … r-bankgpsmp3mp4

Jules_nerd wrote on 2026-09-09, 21:39:

presumably the data its sending to the M6117 must be standard ps2 keyboard data - though I dont understand how that fits in with the scan code errors that javispedro1 mentions.

Well, when it reads the keyboard matrix , the "scancode" it sends to the m6117 is the wrong one. For example, it sends the one for the left alt key for both right&left alt keys. A real PS/2 keyboard would send different scancodes for all keys, but in here the µc is merging them for some reason (since I'm assuming in the physical book386's keyboard matrix you can scan for both keys separately).

Ah! ok thanks for the explanation, I get it now!