Analysis complete at last!When I input a key from the M343SX keyboard, it was output to the terminal screen! At the same time, the fact that this was possible meant that the key code was an ASCII code. [Analysis results] The protocol is as…

ついに解析できました！ Terminalでキーボードと接続し、キー入力を読み取ることができました。同時に、これができるということはキーのコードはアスキーコードであることも判明しました。 キー入力したものがターミナル画面に出ています。 プロトコルは以下…

In the end, I decided to remove the ROM inside the keyboard and read out the binary file. The ROM used in this keyboard, TMM2464AP, is compatible with 27C64, so I was able to read it out with an inexpensive ROM writer TL866CS. I was able t…

After much struggle, I was able to remove the PLL sub-board. As you commented, it was tightly soldered. PLL sub-board After removing the PLL sub-board and analyzing the circuit, I was able to obtain the following wiring diagram. However, i…