[Sega Model 2 Emulator | EVERYTHING Pre Configured inc Controls. For PC, Controller, Mouse & Light guns. Test Menu's Configured. Analogue Inputs Calibrated. Free Play. All Games in English. 2 Player Mouse Support. No Screen Flash]

Thanks for setting me on the right track @Warped Polygon. I just recently discovered the Sega Model 2 Emulator, since Mame falls short on the model 2.  Two of my son's favorite Sega Model 2 games were House of the Dead and Dynamite Cop.  I wanted to get House of the Dead working with my AimTrak and struggled with some solutions for reloading off screen. As a take on your HOTD LUA script and for more authentic game play, I tied reloading (and health) to the AimTrak buttons 2 and 3.  For anyone interested, here is the modified LUA script...

require("model2")
function Init()
end
function Frame()
	Model2_SetWideScreen(1)
	Model2_SetStretchALow(1)
	Model2_SetStretchBLow(1)
	Model2_SetStretchAHigh(1)
	Model2_SetStretchBHigh(1)
	Evaluate_Inputs();
end

function health_1p_cheat_f(value)
	I960_WriteWord(RAMBASE+0x1EC10,5); -- 1P 5 health
end
function ammo_1p_cheat_f(value)
	I960_WriteWord(RAMBASE+0x1EC41,6); -- 1P 6 ammo
end

function Evaluate_Inputs()
    if Input_IsKeyPressed(JOY1+JOY_BUTTON2) == 1 then
       I960_WriteWord(RAMBASE+0x1EC41,6); -- 1P 6 ammo
    end
    if Input_IsKeyPressed(JOY1+JOY_BUTTON3) == 1 then
       I960_WriteWord(RAMBASE+0x1EC10,5); -- 1P 5 health
    end
end

Options =
{
	health_1p_cheat={name="1P Infinite Health",values={"Off","On"},runfunc=health_1p_cheat_f},
	ammo_1p_cheat={name="1P Infinite Ammo",values={"Off","On"},runfunc=ammo_1p_cheat_f}
}