static WRITE_HANDLER(ngg_wpc_w) {
static int lastFlip, lastWheel = 0;
// writes to the flippers have to be delayed 1 cycle to not interfere with the flashers.
// also, an intermittent 0 byte write has to be avoided.
if (!(data & 0xc0) && offset == WPC_FLIPPERCOIL95) {
if (lastFlip & data & 0x3f) wpc_w(WPC_FLIPPERCOIL95, data);
if (!lastFlip & !data) wpc_w(WPC_FLIPPERCOIL95, 0);
lastFlip = data;
} else
wpc_w(offset, data);
// Wheel state handling
//
// Wheel motor is driven by two solenoid outputs
// The solenoid drivers are fed to the input of a motor driver chip with
// active low inputs. So the inputs are active when the solenoid outputs
// are _not_ energised.
// solenoid 38 drives wheel clockwise (state decreases by one)
// solenoid 37 drives wheel counter clockwise (state increases by one)
//
// there are 64 states and 16 positions on the wheel
// Wheel position sensing is provided by two optos as shown in table
//
// Wheel 0000 0000 0011 1111 1111 2222 2222 2233 3333 3333 4444 4444 4455 5555 5555 6666
// State 0123 4567 8901 2345 6789 0123 4567 8901 2345 6789 0123 4567 8901 2345 6789 0123
//
// Inner 0111 1111 1111 1111 1111 1111 1111 1111 1110 0000 0000 0000 0000 0000 0000 0000
// Outer 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011
//
// Pos. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
if (offset == WPC_SOLENOID1) {
if (lastWheel & ~data & 0x20) {
locals.wheelpos++;
if (locals.wheelpos > 63)
locals.wheelpos = 0;
}
if (lastWheel & ~data & 0x10) {
locals.wheelpos--;
if (locals.wheelpos < 0)
locals.wheelpos = 63;
}
core_setSw(swInnerWheel, locals.wheelpos > 0);
core_setSw(swOuterWheel, locals.wheelpos % 4 == 0 || locals.wheelpos % 4 == 3);
lastWheel = data;
}
}
static WRITE_HANDLER(cftbl_wpc_w) {
UINT8 state;
wpc_w(offset, data);
if (offset == WPC_SOLENOID3) {
state = 1 << ((GET_BIT7 << 1) | GET_BIT3);
coreGlobals.lampMatrix[8] = coreGlobals.tmpLampMatrix[8] = (state << 4) | state;
}
}
static WRITE_HANDLER(afm_wpc_w) {
wpc_w(offset, data);
if (offset == WPC_SOLENOID1) {
HC4094_data_w (0, GET_BIT5);
HC4094_clock_w(0, GET_BIT4);
HC4094_clock_w(1, GET_BIT4);
}
}
