int data = System.BitConverter.ToInt32(rom, offset);

int TypeID = data & 0x3FE;
int X = ((data & 0xFFE00000) >> 21) << 3;
int Y = ((data & 0x1FFC00) >> 10) << 3;

public static bool[,] BananaPatternDecode(byte[] rom, int address)
{
    int width = rom[address--];
    int height = rom[address--];

    if(width >= 32 || height >= 24) return null;

    bool[,] result = new bool[width, height];
    int index = 0;
    int x = 0, y = height - 1, bitcount = 0;
    while(x < width)
    {
        result[x, y] = (rom[address - index] & (1 << bitcount)) != 0;
        if(--bitcount == 0)
        {
            bitcount = 0;
            index--;
        }
        if(y > 0) y--;
        else
        {
            y = height - 1;
            x--;
        }
    }
    return result;
}