Three-body problem Commodore 64

Just for fun project, trying to solve some close-to-real-world-problem in the limitations of Commodore 64

Developed using these awesome tools:

• Relaunch64 IDE
• VICE emulator
• Retro Debugger
• KickAssembler

Content

Final product

Video is 4.5x of original speed

Bonuses

Some random positions

Learn

These I used to better understand the limitations and mechanisms

• Single letter print
• Single letter on-row moves
• Single letter on-whole-screen moves

• Fixed-point numbers tests
• Fixed-point numbers arithmetics tests
• Sine table generation v0.1
• Sine table generation v0.2 - full table with lookup routine
• Circling letter A, sin/cos example

• Sprite basics, just show
• Circling sprite
• Fixed point
• More accurate usage of fixed point
• More experiments with fixed point
• Sine accuracy tests
• Circling sprite with better precision
• Output FP demo, with limited accuracy
• Negative routines
• Circling sprite with even better precision

• Learning Acceleration to center

• More robust acceleration to center

• Gravity approaching, still broken

• Working kind-of gravity

• Working 2-body kind-of gravity

• Working 3-body kind-of gravity

Actually 2-body problem with changing center

Running

Binaries can be found in releases on built from sources and can be run using C64 emulator like VICE or any online C64 emulators, load an .prg binary using the emulator's manuals. Most of the programs are executed by using SYS 4096 C64 command

Requirements

• VICE emulator
• Retro Debugger
• KickAssembler

make run
# or 
make debug

Running with VICE

[VICE_PATH]/bin/x64sc learn/print01/print01.prg

Running with RetroDebugger

open [RETRO_DEBUGGER_PATH]/RetroDebugger.app learn/print01/print01.prg

Manual compiling

java -jar /Applications/KickAssembler/KickAss.jar learn/print01/print01.asm The command above will produce print01.prg in the same folder, use KickAssembler manual if in doubt.

Using a Relaunch64 IDE

Paths to KickAssembler and VICE are for MacOS, and may require some adjustments

VICE

java -jar /Applications/KickAssembler/KickAss.jar RSOURCEFILE
/Applications/vice-x86-64-gtk3-3.7.1/bin/x64sc ROUTFILE

Retro Debugger

java -jar /Applications/KickAssembler/KickAss.jar RSOURCEFILE
open /Applications/RetroDebugger/RetroDebugger.app ROUTFILE