My Atari 2600 emulator written in Python success version 1

Progresses

• Uses Py65 as CPU.
• Removes all debug ablities.
• No sound.
• Only some games are playable. The fire button would not work in some games.

Downloads

• http://adf.ly/1AC211

Requirements

• PyPy3
• pysdl2-cffi
• Py65

Resources

• STELLA PROGRAMMER'S GUIDE
• Stella Integrated Debugger (a work in progress)
• Rockwell 6502 Programmers Reference
• The Overflow (V) Flag Explained by Bruce Clark
• atari 2600 programming specs, HTML version
• Atari 2600 Programming for Newbies

Comments

• The FPS varies depending on games, which are from 30 to 40 FPS. Because the sound may be affected by the speed of the game, i have to optimize the emulator first. Although the bottleneck is still in TIA, there are no places that can make a significant speed up. I decide to put everything together, which should have some better effects. The way putting everything together will make the codes in a mass, that's why i have to make a backup here for safety.

• The Atari 2600 emulator performance distribution

  objects	30 FPS	40 FPS
  MOS 6507	12.04%	08.73%
  memory and memory map	06.32%	04.90%
  TIA total	76.08%	82.94%
  TIA get objects colors	48.40%	38.14%
  TIA collision detection	04.52%	04.90%
  TIA draw color	02.04%	02.45%
  PIA 6532	00.32%	00.29%
  cartridge	00.12%	00.10%
  controller	00.16%	00.39%

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