Latest release of ProDOS is 2.4.3

ProDOS 2.5 alpha 8 pre-release is available

ProDOS 2.4.2

Download ProDOS 2.4.2

Announcing ProDOS 2.4.2 for all Apple II computers

  • ProDOS 2.4.2 is a minor release with bug fixes and updates.
  • ProDOS 2.4.2 replaces the previous ProDOS 2.4 and ProDOS 2.4.1.


Bugs fixed:

  • If a directory with more than 255 files was used, and then a different disk was used, a Bad Dir Error $51 was reported.
  • Bitsy Bye was not compatible with the Appletalk Workstation card.
  • Bitsy Bye was not compatible with the Mac LC Apple IIe card.



  • Thunderclock driver is updated for years 2018 – 2023
  • ADT Pro v2.0.2
  • Copy II Plus v8.4
  • Added Cat Doctor’s extended utilities


If you would like to help develop or test future versions, please contact me.




— John Brooks


Twitter: @JBrooksBSI


Download ProDOS 2.4.2


If you’d like to support John Brook's efforts to improve the Apple II, donations are welcome using: PayPal