Quote:

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with this code somehow works even if it doesn’t cycle in a predictable way

you cannot prevent this, the game read the input faster then you finger can release the key, so the game read that you are pressing the button more than one time and cycle through the views


UGLY code, but working

static READ32_HANDLER( port1_r )
{
static UINT8 cur_view = 0;
UINT16 viewval = readinputport(1); //total actual values stored in memory
UINT8 button_pressed = viewval & 0x0010;

if (!button_pressed) // check if button is pressed
{
cur_view++;
if (cur_view == 4)
cur_view = 0;
viewval = (viewval | 0xf0);

switch (cur_view){
case 0:
viewval = viewval & 0xef;
break;
case 1:
viewval = viewval & 0xdf;
break;
case 2:
viewval = viewval & 0xbf;
break;
case 3:
viewval = viewval & 0x7f;
break;
}
}

return (viewval << 16) | viewval;
}


there is something wrong in that table
the correct one is the follow

[ATTACHED IMAGE]