Coding challenge for array lovers: Decode a ZX-Spectrum computer screen!!!

Hello JavaScript enthusiasts!

Today I’m proposing you a unique coding challenge: decoding of an “encoded” ZX-Spectrum screen. Don’t worry, this challenge requires just knowledge of array manipulation in JavaScript, all the technical details on how the screen is encoded are provided in this article!

All you have to do for this challenge is to write the missing lines of this JavaScript function:

function convertScreen(zxScr)
{
    var screen = new Array(192);
    for(var i = 0; i < 192; i++)
        screen[i] = new Array(256);

    // Write here your tranformation code from zxScr (e.g. encoded screen)
    // to the screen 2D array (e.g. decoded screen)

    // If your decoding works, then you should see the message encoded in this image

    // That message will provide you with the address of a fun website!

    return screen;
}

As you can see, this function takes an argument an array zxScr, that should be transformed and output as a return as another 2D array screen.
The array received as argument contains exactly 6912 numbers and represents an encoded ZX-Spectrum screen.

What is an encoded ZX-Spectrum screen?

Back in the late 70s and 80s, a series of innovative companies launched a series of microcomputers for home users. Perhaps you can still remember Apple II, Commodore 64 or ZX-Spectrum 48K. All these computers were 8-bit machines with very modest specs by today’s standards.

Since resources (especially memory) were at a premium on these machines, their designers found clever ways to ensure that information is encoded in the most space effective way possible.

For instance, ZX-Spectrum had a resolution of 256 x 192 pixels. A simple math shows a true-color 24bpp RGB image in this resolution will require:
256 x 192 x 3 = 147,456 bytes of memory
This is way too much for what ZX-Spectrum had!!!

Even if we encode at 8 bpp will still need:
256 x 192 = 49,152 bytes ! – which is almost the entire memory an 8 bit machine could address in a direct mode (e.g. 64K)

As you can see, ZX-Spectrum designers had to put a lot of though into reducing the video memory need to as a low as possible.

And they succeeded! A ZX-Spectrum 48K needs just 6912 bytes of video memory. The entire screen is encoded in this memory.
And this is the purpose of our challenge. To decode a ZX-Spectrum screen (e.g. memory dump) into a regular 2D matrix.

ZX-Spectrum encoding scheme

These are your specs! If you never worked with a ZX-Spectrum before, then you need to read this chapter to understand the format of the data.

As mentioned, a ZX-Spectrum has a 256 x 192 pixels resolution. However, these pixels are encoded as a monochrome image, with just 2 colors being applied at the level of an 8x8 pixel block (one color named “ink” for set pixels, and one color named “paper” for off pixels)!

This results in big memory savings at the expense of a reduced color!
Since pixels are monochrome, we can encode a series of 8 pixels in a single byte.
Also, we only need 1 byte to represent the attributes of an 8x8 pixels block.

Let’s recalculate the memory needs:

• (256 x 192) / 8 = 6144 bytes needed for the pixel data
• (24 rows x 32 columns ) * 1 byte = 768 bytes needed for attributes / color data
• Total video memory needed: 6144 + 768 = 6912 bytes!

All seems fine... and simple and you’re almost ready to start the decoding function. But wait a second: the designers of ZX-Spectrum had to do other innovations in order to optimize this machine. As a result, the screen lines are not in order. Instead the video memory has three areas. In each area the screen lines are stored in an interlaced order.

At this point I will stop the explanations and invite you to read the following diagram. It is part of the specs and contains all the data you need!

What is a decoded screen?

We mentioned in the beginning of this article that we want to create a javascript function to take an encoded screen (in the above format), decode it and present it as a 2D array in this format:

• 192 lines (matching vertical resolution)
• 256 columns (matching horizontal resolution)
• Each array value will be a number in interval 0 – 7 representing the ZX-Spectrum color that is supposed to be assigned to that pixel.

Input / test data

At this point let me provide you with some input data. The following function returns an array of numbers… more exactly 6912 numbers.

This array contains just that: an encoded ZX-Spectrum screen (e.g. a video memory dump).

Please feel free to implement the convertScreen using your preferred editor. However if you are interested to visualize also the screen, please scroll to the end of the article for info on how to visualize your transformation.

// A ZX-Spectrum screen (e.g. a 6912 bytes video memory dump)
function getZXScreen() { return [
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 254, 0, 15, 255, 255, 255, 255, 255, 255, 227, 241, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 199, 255, 255, 224, 252, 62, 31, 15, 135, 227, 241, 224, 248, 124, 60, 46, 63, 143, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 227, 255, 248, 227, 248, 255, 255, 31, 255, 227, 241, 227, 252, 120, 255, 15, 255, 203, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 248, 255, 31, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 248, 0, 7, 255, 255, 255, 255, 255, 255, 227, 241, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 199, 255, 255, 227, 252, 127, 31, 31, 227, 227, 241, 227, 252, 120, 126, 14, 63, 199, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 225, 255, 240, 227, 252, 127, 255, 31, 255, 227, 241, 227, 252, 120, 255, 14, 63, 227, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 248, 254, 31, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 240, 127, 147, 255, 255, 255, 255, 255, 255, 227, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 199, 255, 255, 225, 252, 255, 143, 31, 227, 227, 241, 225, 252, 120, 255, 14, 31, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 240, 127, 224, 227, 252, 63, 15, 15, 227, 227, 241, 227, 252, 124, 126, 30, 31, 195, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 248, 24, 63, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 240, 255, 227, 255, 255, 255, 255, 255, 255, 227, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 199, 252, 0, 225, 248, 255, 143, 31, 227, 227, 241, 227, 252, 120, 255, 14, 3, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 249, 6, 1, 227, 252, 8, 31, 131, 3, 225, 241, 227, 252, 124, 16, 47, 7, 7, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 252, 0, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 225, 255, 225, 255, 255, 255, 255, 255, 255, 195, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 199, 252, 0, 227, 248, 0, 31, 0, 7, 227, 241, 227, 252, 112, 255, 31, 32, 63, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 252, 0, 3, 227, 254, 64, 63, 136, 7, 226, 113, 227, 252, 126, 0, 15, 0, 15, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 254, 65, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 227, 255, 241, 227, 15, 128, 255, 240, 63, 128, 113, 227, 1, 255, 1, 15, 192, 63, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 199, 252, 16, 227, 248, 0, 14, 16, 3, 227, 241, 227, 252, 113, 255, 15, 128, 15, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 0, 47, 227, 255, 0, 255, 224, 31, 224, 113, 227, 252, 127, 33, 31, 200, 31, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 131, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 199, 255, 243, 226, 15, 0, 127, 192, 15, 132, 113, 226, 0, 254, 0, 15, 0, 31, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 199, 255, 248, 227, 248, 136, 78, 32, 67, 227, 241, 227, 252, 112, 255, 15, 225, 7, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 228, 255, 227, 255, 243, 255, 252, 127, 248, 241, 227, 252, 127, 199, 63, 240, 127, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 128, 63, 255, 255, 255, 255, 255, 255, 243, 241, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 199, 255, 255, 224, 14, 2, 63, 128, 71, 128, 113, 224, 8, 252, 4, 30, 1, 15, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 195, 255, 248, 227, 248, 255, 255, 31, 255, 227, 241, 227, 252, 121, 255, 31, 252, 7, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 31, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 40, 180, 188, 146, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 61, 253, 251, 223, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 122, 235, 89, 205, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 61, 247, 187, 222, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 185, 231, 221, 207, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 167, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 123, 239, 153, 238, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 79, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 61, 247, 187, 223, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 159, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 185, 244, 189, 206, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 247, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 254, 91, 122, 123, 84, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 123, 242, 121, 238, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 251, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 243, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 249, 255, 231, 254, 239, 243, 223, 243, 159, 239, 159, 207, 31, 215, 63, 223, 61, 127, 159, 254, 127, 222, 126, 127, 63, 255, 255, 255, 
    255, 255, 255, 255, 254, 149, 249, 35, 248, 163, 228, 151, 228, 135, 228, 159, 34, 159, 18, 191, 243, 239, 233, 95, 197, 63, 127, 127, 127, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 247, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 251, 255, 247, 252, 207, 251, 132, 147, 191, 247, 223, 223, 127, 231, 191, 207, 126, 255, 191, 255, 127, 239, 127, 127, 191, 255, 255, 255, 
    255, 255, 255, 255, 255, 35, 254, 79, 249, 23, 249, 63, 249, 111, 233, 207, 180, 127, 180, 255, 227, 207, 242, 63, 200, 254, 126, 127, 191, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 251, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 253, 255, 231, 254, 223, 243, 200, 33, 223, 231, 159, 239, 191, 247, 63, 239, 156, 255, 223, 254, 127, 206, 126, 127, 63, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 191, 247, 255, 255, 63, 255, 63, 255, 239, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 167, 254, 159, 253, 51, 250, 95, 244, 239, 191, 223, 122, 127, 116, 253, 255, 127, 250, 127, 233, 254, 233, 233, 255, 255, 255, 255, 
    255, 255, 255, 255, 249, 255, 199, 252, 239, 247, 159, 255, 159, 239, 223, 207, 63, 231, 191, 207, 156, 255, 159, 255, 127, 222, 255, 127, 191, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 223, 199, 255, 255, 191, 255, 191, 255, 215, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 254, 137, 250, 39, 244, 75, 244, 143, 233, 55, 223, 239, 168, 191, 169, 62, 255, 191, 232, 159, 162, 63, 82, 210, 127, 255, 255, 255, 
    255, 255, 255, 255, 251, 254, 239, 253, 207, 251, 207, 255, 223, 247, 159, 223, 95, 215, 63, 223, 217, 255, 191, 238, 127, 239, 126, 127, 63, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 143, 175, 255, 255, 63, 255, 63, 255, 239, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 253, 57, 244, 231, 233, 211, 235, 215, 215, 167, 159, 207, 23, 63, 30, 94, 126, 63, 211, 159, 78, 94, 44, 172, 255, 255, 255, 255, 
    255, 255, 255, 255, 253, 255, 119, 250, 223, 243, 223, 255, 159, 231, 191, 239, 159, 239, 191, 175, 205, 255, 223, 246, 255, 142, 126, 255, 127, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 228, 159, 255, 255, 191, 255, 127, 254, 143, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 250, 254, 107, 249, 247, 227, 223, 231, 175, 199, 191, 223, 95, 207, 95, 158, 255, 127, 175, 230, 191, 158, 190, 62, 63, 255, 255, 255, 
    255, 255, 255, 255, 248, 252, 227, 253, 231, 235, 199, 251, 207, 215, 223, 143, 31, 207, 63, 223, 225, 255, 143, 199, 63, 223, 127, 127, 191, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 232, 63, 255, 255, 63, 255, 191, 255, 31, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 253, 254, 119, 249, 207, 251, 239, 251, 223, 231, 223, 239, 159, 207, 191, 207, 62, 127, 223, 231, 127, 207, 127, 63, 191, 255, 255, 255, 
    255, 255, 255, 255, 254, 122, 245, 233, 231, 211, 243, 227, 215, 167, 143, 79, 151, 79, 143, 31, 203, 255, 231, 175, 62, 158, 126, 127, 63, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 

    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 87, 87, 71, 71, 71, 71, 71, 71, 87, 87, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 87, 87, 87, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 103, 103, 103, 103, 103, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 103, 103, 103, 103, 103, 103, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 103, 103, 103, 103, 103, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 79, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 71, 71, 71, 
    71, 71, 71, 71, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 71, 71, 71, 
    71, 71, 71, 71, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 
    71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71, 71
]};

Testing your code / Visualizing the decoded screen

How do you know if your transformation worked? Since visualization is outside the scope of this article, I prepared a small template program at codeguppy.com

Just plug your convertScreen code into it and if everything is correct, you should see the image.

Test program:

https://codeguppy.com/code.html?uJUcddCtVS9dBZMh3Sbe

Have fun!

Comments

[Adrian]

This is the solution:
codeguppy.com/code.html?tLrGBh8rDO...

[Adrian]

Did you find the message?