README.md

TetrOS v1.05 by Tomasz Grysztar

1. Links

• Back to overview
• How to play
• Archived files
• Source code

2. Summary

• Programming language: Assembly
• Main size: 508 B
• Extra size: 4 B
• Total size: 512 B
• Feature count: 17
• Bytes per feature: 30 B

3. Controls

3.1. Game

• Esc: restart
• F16: pause (DOSBox only)
• ↑: rotate counterclockwise
• ←: move left
• ↓: hard drop
• →: move right

3.2. Pause screen (DOSBox only)

• Any Key: unpause

4. Features

1. All tetrominoes
2. Drop: hard drop, 1 frame lock
3. Faster levels: speed = points / 100 % 4
4. Game over detection
5. Gravity
6. Height score multiplier: 1 + height / 2
7. Horizontal movement
8. Line clearing
9. Line clear points:
   • Single: 1 * multiplier
   • Double: 3 * multiplier
   • Triple: 7 * multiplier
   • Tetris: 15 * multiplier
10. No bugs: except when booted from USB
11. Pause: pause emulation (emulator only)
12. Piece preview: single piece
13. Placement points: 1 * multiplier
14. Random background color: restart if you can't see the walls
15. Restart
16. Retry
17. Rotation

5. Bugs (USB stick only)

1. Color doesn't work
2. The bottom row isn't visible

6. How to play

After downloading the archive, the program can be run in one of these 3 ways:

6.1. QEMU

1. Download QEMU
2. Run the following command, replacing /path/to/tetros.img:

   qemu-system-x86_64 -drive format=raw,file=/path/to/tetros.img

6.2. DOSBox

1. Download DOSBox
2. Run the command for your operating system, replacing /path/to/tetros.img:
   • Windows:

     dosbox -c "BOOT /path/to/tetros.img"

   • MacOS:

     /Applications/dosbox.app/Contents/MacOS/DOSBox -c "BOOT /path/to/tetros.img"

6.3. USB stick (Windows only)

For ASUS laptops, follow this tutorial first.

1. Get an empty USB stick and insert it
2. Download Rufus
3. Open Rufus
4. Select USB stick
5. Set Boot selection to Disk or ISO image
6. Select tetros.img
7. START
8. Restart PC
9. Tap Esc until the boot menu appears
10. Select USB stick
11. Press ↵ Enter