In the area C/3 on sheet 2 there are two similar sections to detect the CRASH1 and CRASH2 signals. However D3 pin 9 and D3 pin 5 shall - according to the schematics - _both_ be connected to 256H! That's senseless, because then both CRASH signals would always occur together. One of both has to be /256H, probably that of player1 (left).