BitPast

Back to the past

Only for Mac

$2.99

Mac

Transform your photos into authentic retro computer art! Support for 15 vintage systems including Apple II, Commodore 64, Amiga, and more. Export to real disk images. Turn your modern photos into authentic retro computer graphics — just like they would have appeared on classic machines from the 1980s and 90s. BitPast accurately recreates the unique visual characteristics of 15 legendary computer systems, complete with their original color palettes, resolution limits, and display quirks. Whether you're a retro computing enthusiast, digital artist, or just feeling nostalgic, BitPast brings the magic of vintage computing to your Mac. SUPPORTED SYSTEMS • Apple II — Hi-Res with 6 colors, artifact colors • Apple IIgs — Super Hi-Res 320/640 modes, 3200-color Brooks format • Commodore 64 — Multi-color and Hi-Res modes, VIC-II palette • Commodore VIC-20 — Multi-color with characteristic palette • Commodore Plus/4 — TED chip's 121-color palette • Amiga 500 — OCS modes including HAM6 (4096 colors) • Amiga 1200 — AGA modes including HAM8 • Atari 800 — GTIA/ANTIC graphics modes • Atari ST — Low, medium, and high resolution • ZX Spectrum — Attribute-based graphics with color clash • Amstrad CPC — Mode 0, 1, and 2 with Gate Array palette • BBC Micro — Modes 0-5 with authentic palette • MSX — Screen modes with MSX1/MSX2 palettes • IBM PC — CGA and EGA graphics modes • TRS-80 Color Computer — PMODE graphics and CoCo 3 modes AUTHENTIC CONVERSION BitPast doesn't just resize and reduce colors. It applies the same constraints and techniques that developers used decades ago: • Accurate color palettes for each system • Proper resolution and aspect ratio handling • Multiple dithering algorithms (Floyd-Steinberg, Atkinson, Bayer, and more) • Attribute-based color handling where appropriate • Contrast and brightness preprocessing REAL DISK IMAGES Export your converted images directly to authentic disk image formats: • ProDOS (.po, .2mg, .hdv) for Apple II/IIgs • D64/D71/D81 for Commodore systems • ADF for Amiga • ATR for Atari 800 • ST for Atari ST • TRD/DSK for ZX Spectrum • DSK for Amstrad CPC and MSX • SSD/DSD for BBC Micro • IMG for PC • DSK for TRS-80 CoCo Load these disk images in emulators or transfer them to real vintage hardware! FEATURES • Batch conversion — process multiple images at once • Real-time preview — see results as you adjust settings • Native macOS app — fast, clean, and privacy-respecting • No subscription — buy once, own forever • Works offline — no internet required Perfect for: • Retro computing enthusiasts • Pixel artists and digital creators • Demoscene and chiptune communities • Educators teaching computing history • Anyone who loves the aesthetic of classic computers BitPast — Because pixels had more character back then.

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Fixed - **Per-Image Lock Now Works During Live Preview** - Locked images now correctly use their saved settings when selected: - Previously, locked settings were only applied during batch export - Now the live preview also respects locked settings, showing the actual conversion result - Switching between images correctly displays each image with its locked (or global) settings Changed - **Locks Cleared on System Change** - When switching to a different retro system, all image locks are now automatically cleared: - Prevents confusion from stale locks that don't apply to the new system - Users must re-lock images with desired settings for the new target system - Lock indicators immediately disappear when changing systems - **Per-Image Conversion Settings** - Lock individual settings for each image during batch export: - Click the **lock icon** in the image toolbar to save current settings for the selected image - Locked images display an **orange lock indicator** on their thumbnail - During batch export or disk creation, each locked image uses its saved settings - Unlocked images continue to use the current global settings - Settings are tied to the machine type (e.g., C64 settings won't apply to Apple IIgs) - Click the lock again to unlock and revert to global settings

Version 4.2

The developer, Walter Tengler, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    • Seller
      • Walter Tengler
    • Size
      • 24.4 MB
    • Category
      • Utilities
    • Compatibility
      Requires macOS 15.7 or later.
      • Mac
        Requires macOS 15.7 or later.
    • Languages
      • English
    • Age Rating
      4+
    • Copyright
      • © 2026 Walter Tengler
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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