r5458 /src/mame/machine/snes.c: [SNES]: improved joypad read/write handling and fixed a serial port quirk.
Fixed various input bugs to make at least version 1.0 of Bishoujo Janshi Suchie Pai to work. iirc there should be a bunch of games that was reporting wrong continous pressure before (Super Tetris 2 & Bombliss comes to mind)
I've also noticed that Libble Rabble, The Skins Game and the aforementioned Super Tetris 2 & Bombliss inputs are buggy (aren't consistant), originally I've thought that was the same bug but in reality they suffer of (guess what) maincpu timing issue...
