Latest release of ProDOS is 2.4.2

ProDOS 2.5 has been announced but is not available yet.

Your Apple II. Enhanced.

ProDOS 2.4.2 is the current release, and available for ALL models of the Apple II.

Features of ProDOS 2.4.2 include:

  • Compatibility with all 8-bit Apple II's
  • Bitsy Bye Program Launcher
  • Disk imaging using ADT Pro
  • Disk utilities
  • ROM ID detection for Apple II clones.
  • Thunderclock driver is updated to work through 2023
Download ProDOS 2.4.2

Bitsy Boot

  • A small system program which allows quick and easy booting of Apple II devices in various slots
  • Allows one-press booting of slots 1-7
  • Displays all slots which contain active ProDOS devices
  • Allows programs to quit to the 8-bit launcher or return to the 16-bit GS/OS Finder
  • More about Bitsy Boot

    Bitsy Bye

  • A new program launcher
  • Select drives by slot using number keys 1-7.
  • Select files by typing the first letter of their filename.
  • Displays the slot and drive of each device
  • Does not abort on drive errors, but instead lists and allows launching of all readable files.
  • More about Bitsy Bye


  • This tiny program can be used instead of Basic.System
  • NOT a BASIC interpreter but a ProDOS wedge for BASIC
  • Requires only 1 block on disk vs 21 blocks for Basic.System
  • Loads and runs Binary and Basic programs launched by Bitsy Bye
  • More about MiniBas