====== 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 [[http://www.a2heaven.com/webshop/index.php?rt=product/category&path=73|A2Heaven]].
  * Boot menu via <key>CTRL+CLOSED-APPLE+RESET</key> or <key>CTRL+OPTION+RESET</key>.
    * 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.
    * <key>CTRL+ESC+RESET</key> toggles accelerator speed and persists across ordinary resets.
    * <key>CTRL+TAB+RESET</key> 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 [[https://github.com/mgcaret/rom4x|ROM 4X and 5X on GitHub]].

===== Releases =====

==== GitHub ====

{{rss>https://github.com/mgcaret/rom4x/releases.atom}}

In addition to the source code, GitHub releases starting October 2017 will have a "binary" release attached that includes binary patches and a patching script to apply them to a source ROM.