Re - Hoop up the ym3812 for the trsocean

[flama12333]

there are system test by press key 9.
still can play sfx and music of the ym3812. since its not removed from the code but unused.

[flama12333]

there are no present in the hw at System test.
if play the music will cause unmapped write which is the opl2
[:maincpu] ':maincpu' (5C67): unmapped program memory write to 0D016 = B0 & FF
[:maincpu] ':maincpu' (5C70): unmapped program memory write to 0D017 = 2E & FF
[:maincpu] ':maincpu' (5C67): unmapped program memory write to 0D016 = B0 & FF
[:maincpu] ':maincpu' (5C70): unmapped program memory write to 0D017 = 0E & FF
[:maincpu] ':maincpu' (5C67): unmapped program memory write to 0D016 = A0 & FF
[:maincpu] ':maincpu' (5C70): unmapped program memory write to 0D017 = 22 & FF
[:maincpu] ':maincpu' (5C67): unmapped program memory write to 0D016 = B0 & FF
[:maincpu] ':maincpu' (5C70): unmapped program memory write to 0D017 = 32 & FF
[:maincpu] ':maincpu' (5C67): unmapped program memory write to 0D016 = B0 & FF
[:maincpu] ':maincpu' (5C70): unmapped program memory write to 0D017 = 12 & FF
I had to hook up
https://github.com/user-attachments/assets/3baadf4b-5007-4352-862b-c61b816ca927

Closed for now.

[galibert]

To be clear, there is a place on the PCB for an opl2, but it's not populated. The rom has remnants of when it was there in development.