Kirby Tilt and Tumble lua

memory.usememorydomain("System Bus")
AddrXBig        = 0xFFA5;
AddrXSmall      = 0xFFA6;
AddrXSub        = 0xFFA7;
AddrXSpd        = 0xFFD2; --big endian 16
AddrYBig        = 0xFFA8;
AddrYSmall      = 0xFFA9;
AddrYSub        = 0xFFAA;
AddrYSpd        = 0xFFD4; --big endian 16
AddrZBig        = 0xFFAB;
AddrZSmall      = 0xFFAC;
AddrZSub        = 0xFFAD;
AddrZSpd        = 0xFFD6; --big endian 16

PrevX = 0
XDiff = 0
PrevY = 0
YDiff = 0
PrevZ = 0
ZDiff = 0

XPosTable = {}
YPosTable = {}

XColor = "white"
XDiffColor = "white"
XSpdColor = "white"

--gui.defaultPixelFont("gens")
gui.defaultPixelFont("fceux")

while true do
    emu.frameadvance();
    --Position
    XSmall=memory.readbyte(AddrXSmall);
    XBig=memory.readbyte(AddrXBig);
    X=XBig*256+XSmall;

    XSub=memory.readbyte(AddrXSub);
    X = (X + (XSub/256))

    XDiff = X - PrevX;
    PrevX = X;

    --in this game vertical travel is what needs to be compared, generally
    --[[if (XPosTable[emu.framecount()] == null or XPosTable[emu.framecount()] == X) then
        XPosTable[emu.framecount()] = X;
        XColor = "white";
    elseif (XPosTable[emu.framecount()] < X) then
        XPosTable[emu.framecount()] = X;
        XColor = "green";
    else
        XColor = "red";
    end]]
    --[[if XDiff>1.5 then
        XDiffColor = "green"
    elseif XDiff<1.5 then
        XDiffColor = "red"
    else
        XDiffColor = "white"
    end]]

    YSmall=memory.readbyte(AddrYSmall);
    YBig=memory.readbyte(AddrYBig);
    Y=YBig*256+YSmall;
    YSub=memory.readbyte(AddrYSub);
    Y = (Y + (YSub/256))

    YDiff = Y - PrevY;
    PrevY = Y;

    if (YPosTable[emu.framecount()] == null or YPosTable[emu.framecount()] == Y) then
        YPosTable[emu.framecount()] = Y;
        YColor = "white";
    elseif (YPosTable[emu.framecount()] > Y) then
        YPosTable[emu.framecount()] = Y;
        YColor = "green";
    else
        YColor = "red";
    end

    -- negative 2 pixels per frame is the target speed
    if YDiff<-2 then
        YDiffColor = "green"
    elseif YDiff>-2 then
        YDiffColor = "red"
    else
        YDiffColor = "white"
    end

    ZSmall=memory.readbyte(AddrZSmall);
    ZBig=memory.readbyte(AddrZBig);
    Z=ZBig*256+ZSmall;
    ZSub=memory.readbyte(AddrZSub);
    Z = (Z + (ZSub/256))

    ZDiff = Z - PrevZ;
    PrevZ = Z;

    --the speed variables are not proving useful/accurate compared to diff
    --Speed
    --XSpd=memory.read_s16_be(AddrXSpd)/256;
    --YSpd=memory.read_s16_be(AddrYSpd)/256;
    --ZSpd=memory.read_s16_be(AddrZSpd)/256;

    gui.pixelText(3, 2, string.format("% 9.3f",X),XColor)
    --gui.pixelText(10, 18, string.format("% 9.3f",XSpd),XSpdColor)
    gui.pixelText(3, 11, string.format("% 9.3f",XDiff),XDiffColor)

    gui.pixelText(58, 2, string.format("% 9.3f",Y),YColor)
    --gui.pixelText(65, 18, string.format("% 9.3f",YSpd))
    gui.pixelText(58, 11, string.format("% 9.3f",YDiff),YDiffColor)

    gui.pixelText(113, 2, string.format("% 7.3f",Z))
    --gui.pixelText(120, 18, string.format("% 9.3f",ZSpd))
    gui.pixelText(113, 11, string.format("% 7.3f",ZDiff))


end