Atari2600_ARM

A full Atari 2600 with fully working ARM core support for Mister FPGA!

26 August 2026 release

• Flickerbend has been set to ON by default for improved rendering of various games on CRT (removing flickering).
  Improved timing.

25 August 2026 release

• JANE mapper added (Tarzan prototype), merged from the Atari7800_MiSTer core.
• Flickerblend fixed (Yar's Revenge and others): the one-frame store it needs
  had been dropped, so the option was blending each pixel with its left-hand
  neighbour - a horizontal blur - instead of blending the frame with the one
  before it. The flicker stayed. Fix sent back upstream as issue #37.
• Flickerblend again: the frame store is frozen while the core is paused
• GridLock now works: it no longer starts with every grid but the first marked
  LOCKED. The 6507 was overwriting the command byte while the ARM was still
  running its first call, so the ARM ran the wrong handler.
• SaveKey / AtariVox memory now powers up at 0xFF, like an erased EEPROM,
  instead of 0x00. A game looking for its own save used to find one that said
  nothing was unlocked, rather than an empty slot.
• Playfield-related collisions are no longer flagged during hblank, and the
  playfield register is no longer reset by hblank (merged from upstream).
• Stabilize Video is forced on while the OSD is open, so the menu shows up on
  the analog output with games whose VSync/VBlank is out of spec; pause and
  freeze are delayed to let the stabilizer produce a whole frame (upstream).
• The Bankswitching OSD list and the internal mapper enum were realigned with
  the 7800 core, so forcing a mapper by hand from the menu selects the one you
  picked.

21 August 2026 release:
FA2 mapper added (Star Castle)

17 august 2026 release:
Fixed TIA Stereo sound and Quadtari issue