Yes, it has been a very long time since I updated here due to the lack of information on these little things.
Previously, I have only managed to get a partial dump of the ROM - possibly only the first 8 megabytes.
However, someone on the 'net has managed to upload another schematic of the ROM carrier board - this time there's a slight variation on the A22 and A23 pin which I couldn't locate earlier:
(Thanks to the person who uploaded this - I couldn't find this link anymore!)
I took out that dumper board which I made it using the Raspberry Pi and some MCP23017s since 2020 and tried to reconnect the A22 and A23. However, the dumping is pretty slow and could take a day or so, and as a little preview I managed to see some menu cut-outs and game titles inside (I dumped from 0x80000 onwards). I believe that it has a menu in Mandarin too:
And I found a list of game using the HxD too:
Earlier in 2022, someone examined the ROM dump and uploaded it into a forum, however these dumps couldn't be downloaded, it's a broken link instead: https://4pda.to/forum/index.php?showtopic=979648&st=480:
Not only the person had dumped it but he/she had possibly get it to work using the EmuVT emulator:
Also, there are a number of videos that is showing the unit being modified to play other compilation of games:
There are no schematics provided or instructions posted in these videos, so if there are any new information on these, you can put in the comments below! :D