Compatibility testing
Games tested and confirmed as working
This page tracks real test results for the browser-based Jupiter Ace game runner. It is deliberately practical: which format was tried, whether it launched, and what the player needs to know.
The emulator is still a work in progress. A title appearing here means it has been observed loading and running in the current test cycle, not that every version, tape image, control option or sound routine is guaranteed perfect.
ROM ........... USER SUPPLIED
TAP ........... SUPPORTED
TZX ........... EXPERIMENTAL
STATE RESET ... EACH LOAD
RESULTS ....... RECORDED _
Compatibility notes are based on observed tests during the July 2026 build cycle.
Confirmed working
Observed working in the emulator
| Game | Format tested | Status | Notes |
|---|---|---|---|
| Greedy Gobblers | TAP | Working | Playable with remapped controls. The apparent static ghost is likely the ghost cage using the same economical sprite artwork. |
| Blowing Up the World | TAP | Working | The plane moves automatically and wraps around the screen. Press 1–8 to drop bombs at different depths and clear the map before the timer expires. |
| Snakez | TAP | Working | Runs after the cold-load isolation fix. Build 66 adds support for the short FEh speaker-pulse style used by this z88dk title; retest sound in-browser. |
| Tetris / Tetriz homebrew | TAP | Working | Homebrew interpretation tested from itch.io. Build 66 adds support for the short FEh speaker-pulse style seen in this TAP; retest sound in-browser. |
| Pac-Man homebrew | TAP | Working | Homebrew version tested successfully. Sound has not been confirmed. |
| Centipede | TAP | Working | Runs and plays. Build 62 maps cursor keys to I/J/L/M movement and Space to the original A fire key. Soundbox-specific effects are not yet emulated. |
Loads or profiles added, awaiting wider confirmation
Under review
| Game | Format tested | Status | Notes |
|---|---|---|---|
| Ace Invaders | TAP | Profile added | Uses a special sequence: LOAD graphics, GR, FORGET GR, LOAD run, then run. Needs final public-build retest. |
| Rocks ’n’ Ghosts | TAP | Profile added | Homebrew title reaches gameplay after Build 63 added missing IXH/IXL/IYH/IYL Z80 support. Build 65 maps cursor keys to QAOP movement. |
| Altairis | TAP | Profile added | Homebrew Tetris-style puzzle game. Build 65 loads alt32 but launches ALTAIRI, with cursor keys mapped to A/D/W/S and Space mapped to rotate. Needs final gameplay retest. |
| Ace Mines | TAP / TZX | Profile added | DICT-only expanded-RAM game. Build 60/61 warms the ROM with expansion RAM already configured, which should improve this class of title. |
| Cavern Attack | TAP / TZX | Runs, controls under review | A moves up, Z moves down and Enter starts. Uses the graphics/GR/FORGET GR pattern before running. |
| Asteroids | TZX | Profile added | Basic TZX conversion corrected for standard blocks with leading tape flag bytes. |
| Brick Catcher | TZX | Profile added | Simple standard-speed TZX with a BRICKC dictionary item. Needs public-build retest after the TZX flag fix. |
Testing caveats
What “working” means here
Version-specific
Jupiter Ace archives often contain multiple releases, re-saves or TAP/TZX variants. A profile may match one file exactly but still need adjustment for another.
TZX is experimental
The emulator currently extracts simple standard-speed TZX data blocks. Advanced TZX timing, custom loaders and direct recordings remain outside the guaranteed path.
Sound is first-pass
The beeper layer now listens for both the older bit-4 style and the short bit-0 FEh port pulses used by some z88dk-built homebrew titles. Some games may still be silent because they have no sound, require Soundbox/AY hardware, or use a pattern the emulator does not yet catch.
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