ROM 4X and 5X

ROM 4X and 5X are enhanced firmwares for the Apple //c and Apple IIc Plus.

Main features:

  • Initializes memory expansion card without erasing it if it already contains a boot sector. This is intended for battery-backed memory expansions made by A2Heaven.
  • Boot menu via CTRL+CLOSED-APPLE+RESET or CTRL+OPTION+RESET.
    • Allows dropping into the monitor immediately.
    • Allows clearing memory expansion card.
    • Allows launching diagnostics.
    • Allows selecting boot device.
      • 4X: Allows booting external 5.25 drive if disk supports it.
  • 4X: With battery-backed RAMdisk, can configure default boot option.
  • 5X: Replaces accelerator firmware.
    • CTRL+ESC+RESET toggles accelerator speed and persists across ordinary resets.
    • CTRL+TAB+RESET brings up a menu that lets you set accelerator state and some option.

In development:

  • 5X - default boot option configuration like 4X, enhanced to set default accelerator state as well.

See ROM 4X and 5X on GitHub.

Releases

GitHub

Binary Distributions

I'm not guaranteeing these are up-to-date with the master branch, but they are mostly stable.

2017/10/02

Note that only the build process and introduction of the binary distributions has changed, no changes to code are reflected in this release.

ROM 4X

ROM 5X