Midway Omega race
Missing roms at location e1 and f1
No sound board

.j7	2732	hand written/printed sticker	O.R.
						4	7/27	only 7/27 was hand written

.k7	2732	hand written/printed sticker	O.R.
						3	7/27	only 3 and 7/27 were hand written

.l7	2732	hand written/printed sticker	O.R.
						2	7/27	only 7/27 was hand written

.m7	2732	hand written sticker		OR
						1	7/27



Mame 0.221 2020-05-19
C:\Siftware\roms>c:\games\mame_command\mame64 -romident c:\siftware\roms\omega2\roms\omega2.j7 
Identifying c:\siftware\roms\omega2\roms\omega2.j7....
omega2.j7           = o.r._4a.j7            omegrace2  Omega Race (set 2)

C:\Siftware\roms>c:\games\mame_command\mame64 -romident c:\siftware\roms\omega2\roms\omega2.k7 
Identifying c:\siftware\roms\omega2\roms\omega2.k7....
omega2.k7           = o.r._3a.k7            omegrace2  Omega Race (set 2)

C:\Siftware\roms>c:\games\mame_command\mame64 -romident c:\siftware\roms\omega2\roms\omega2.l7 
Identifying c:\siftware\roms\omega2\roms\omega2.l7....
omega2.l7           NO MATCH

C:\Siftware\roms>c:\games\mame_command\mame64 -romident c:\siftware\roms\omega2\roms\omega2.m7 
Identifying c:\siftware\roms\omega2\roms\omega2.m7....
omega2.m7           = o.r._1a.m7            omegrace2  Omega Race (set 2)

Mame driver only showed one sound command documented (0x00 - reset)
During the debugging of the the board, I decoded the rest of the sound commands.

0x01 - Player dies
0x02 - Kill droid ship
0x03 - Kill photon mine
0x04 - Finish level
0x05 - Not used?
0x06 - Not used?
0x07 - Player fire
0x08 - Player hit wall
0x09 - Player thrust - loops constantly
0x0A - Not used?
0x0B - Background command ship rate 0 - loops constantly
0x0C - Background command ship rate 1 - loops constantly
0x0D - Background command ship rate 2 - loops constantly
0x0E - Background command ship rate 3 - loops constantly
0x0F - Background death ship - loops constantly
0x10 - Kill command ship
0x11 - Kill vapor mine
0x12 - Coin
0x13 - Tilt
0x14 - Free game
0x15 - Kill death ship
0x16 - Audio test sound - loops constantly
0x17-0x7F - Not used?
0x80-0xFF - does the same as 0x00 - 0x7F

All looping sounds continue until a 0x00 command is sent