Update joy.c
Changed joyAxisY[port] in static u16 readMouse(u16 port) as Y axis was wrong (input was correctly captured but direction reversed).
@@ -768,7 +768,7 @@ static u16 readMouse(u16 port)
if (md[0] & 0x02)
my |= my ? 0xFF00 : 0xFFFF; /* y sign extend */
joyAxisX[port] += (s16)mx;
- joyAxisY[port] += (s16)my;
+ joyAxisY[port] -= (s16)my;
if (md[1] & 8) val |= BUTTON_START;
if (md[1] & 4) val |= BUTTON_MMB;
