Check it out here: https://github.com/Frodevan/TDV-5010_Firmware
The code should work with ASEM-51, and it should be pretty easy to roll your own key-mapping if you have this keyboard want to patch up the firmware. Only challenge is the checksum, which is fundamentally a standard byte-sum of the whole ROM, but also with +1 for each byte overflow when adding together the sum. The final number after running this algorithm should be 0AAh. An easy way is to take an ordinary 32-bit byte-sum, and then add together all four octets of this 32-bit sum. Valid numbers then are 0AAh, 1A9h, 2A8h, and 3A7h.
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