SEMATORSTOP DRIFT ON RELEASE
Stops sideways coasting; keeps original acceleration and top speed
GAME GUIDE / 1.1.320
Xenon 2: Megablast
The sequel, with Bomb the Bass on the soundtrack. Forward and reverse scrolling, and a shop between waves.
SEMATOR CONTROL DECK
Your controls, at a glance.
Joystick moves the ship; fire shoots. Fire and Space are available for game prompts. Shop and name-entry keys remain available to bind.
Select a button to see its action.
Original SemaTor controller illustration. Face buttons 1–4 correspond to south, east, west and north. A/B/X/Y in the table are SDL layout names; your pad’s printed labels may differ.
| Control | Action |
|---|---|
| Move (joystick) | |
| Move (joystick) | |
| Fire | |
| Fire | |
| Space key — game prompts | |
| Space key — game prompts | |
| Unassigned | |
| Fire | |
| Unassigned | |
| Unassigned | |
| Session menu (F11) | |
| SemaTor settings (F12) | |
| Unassigned axis / click | |
| Left stick click / Guide / extra buttons | Unassigned by default. Device or system Guide behaviour can vary. |
Keyboard & mouse
Default keyboard joystick mapping: arrow keys move, Left Ctrl fires and Space sends the original Space key. Original game keys remain available.
These are release defaults, not your saved remaps. Open F11 → Controls for this game for live mappings, or F12 → Controls to change them. Start and Back remain reserved for SemaTor menus. Mouse speed is adjustable. One active host gamepad is supported; two-player modes do not imply two simultaneous gamepads.
CHOOSE YOUR DISK
Verified editions & checksums
These are the exact identities used by the enhanced profiles in SemaTor 1.1.320. A recognised profile is not a promise that every level, option or graphics device has been tested.
Tested in 1.1.320 for 600 million instructions, including 10,161 observed gameplay frames, without a CPU fault or host crash. GPU optical-flow behavior was not exercised by that headless run.
Supplied disk image
Xenon 2 - Megablast.st · 819200 bytes
Disk-image SHA-256: 36be46b4d622eaa2930af3fbd38e2842975157b3e56a3542202116ab3e46f42b
Compare the extracted .st or .stx file, not its ZIP. Windows PowerShell: Get-FileHash -Algorithm SHA256 "your-disk.stx". Linux: sha256sum "your-disk.stx". A different disk hash may still contain a supported program; use the profile identities below.
| Edition / program | Identity | Bytes |
|---|---|---|
| Xenon 2 - Megablast (1989, The Bitmap Brothers) BOOT | boot-sector SHA-17f59cf71891b17c8220713e3dae89212e4d14d39 | 512 |
Program SHA-1 covers the raw executable text before relocation, excluding its file header. Boot SHA-1 covers the decoded 512-byte boot sector. Neither is the checksum of the whole PRG, STX or ZIP. SemaTor’s library problem-report draft includes the executable SHA-1 and whether it is exactly recognised.
Download the edition/checksum list. If your edition is different, report its identity before assuming its enhanced profile is compatible.
OPTIONS BY EDITION
Make it your game.
Names match the release profiles, including experimental and practice options. Availability depends on the recognised disk edition. A matching filename alone does not verify an edition; untested releases may behave differently.
Xenon 2 - Megablast (1989, The Bitmap Brothers)
NO DAMAGE
Prevents energy loss from hits; not a level-skip or collision remover
KEEP LIVES
Death and respawn still happen, but do not consume a life
INDEPENDENT MUSIC + EFFECTS
Separate synths; no stolen voices or shared-channel music attenuation
SPRITE MOTION GUIDANCE
Object motion for Compute HQ / Optical Flow / CPU Motion framegen
REDUCE BUSY-SCENE SLOWDOWN
Experimental: 2x sprite drawing clock; keeps normal gameplay wait
Playing on Android or Thor?
Android and dual-screen controls remain in testing. Touch layouts can differ from desktop gamepad defaults. Mega lo Mania’s Thor panel and direct-touch input need device validation; this guide does not certify every touch layout.