>Do you remember where the procedure was?
Or where the stage changes were?
I know someone who would be able to do it, but he is lazy, so If I could get more information, it would help him fix it where it will work on a real machine.
1,Execute XM6 pro and insert the disk2 of Y2.
2, Set the breakpoint.
Click the "表示(v)"→"プロセッサ(processor)"→"ブレークポイント(break point)"
right click→"アドレスを指定(enter the address)"→5890A
3,Reset the xm6.and the emulator will stop at 5890A.
4 Show the memory window and change the codes(mov.l #00053b26,$0004ffc0) to NOP(4E71)
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That's it You can see player's ship.
Sorry,I forgot the stage changing point unfortunately.
If I remember it,I will post it on this.
I have found this protection check point using the mc68000 disassemble program I made half a year ago.
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If I get sufficient time in the future,I try to disassemble the all codes to make it run in real machine.