chiogros / png512

A bootsector rickroll, where you can display a (tiny) image.

PNG512

A i386 bootsector rickroll.

A custom image can be displayed in place of the rickroll.

Space

You can use images with less than (approximatively) 812 pixels (512 - 106) * 2 = 812:

• 512 bytes, size of bootsector
• 106 bytes, size of code
• 2 pixels / byte

Depending on the opcodes pixels create, there could be less space available.

Image can't be larger than 255 pixels.

How to use

1. Craft your PNG with a paint like software, using the BIOS color palette
2. Generate the bytecode of your image with png2hex.py

$ python png2hex.py rick.png

3. Paste the bytecode in rick.asm, after setting width and height

img:
    .width     db    27
    .height    db    29
    .pixels    db    0xff,0xab,...

4. Compile (you need the make package)

$ make
nasm -f bin rick.asm

6. Run in a QEMU environment (you need qemu and qemu-system-i386 packages)

$ make run
qemu-system-i386 -display spice-app -fda rick

Color palette

When drawing your PNG, you need to use these colors:

Color	Hex
Dark	#000000
Blue	#0000AA
Green	#00AA00
Cyan	#00AAAA
Red	#AA0000
Magenta	#AA00AA
Brown	#AA5500
Light gray	#AAAAAA
Dark gray	#555555
Light blue	#5555FF
Light green	#55FF55
Light cyan	#55FFFF
Light red	#FF5555
Light magenta	#FF55FF
Yellow	#FFFF55
White	#FFFFFF

Reference: BIOS color attributes

Images

Rickroll pixel art

Blurry due to the image zoom.

Rickroll on i386 QEMU