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ROMX Logo.png

ROMX, Current Version

The ROMX is a project designed and produced by, a collaboration of Dean Claxton and Jeff Mazur. Currently the project is for the Apple II and II Plus. Other versions are in the works.

On November 17th, 2020 the ROMX was released for resale by ReActiveMicro.

Product Status: Actively resold by ReActiveMicro.

Support: Post on the Discussion page (link above) or email ReActiveMicro Support.

Sales: Visit the ReActiveMicro Store.

What Is The ROMX[edit]

ROMX is an in-system programmable device that replaces the system ROM’s in your Apple II or II+ computer. It will store up to 15 ROM images, and present them for selection via an on-screen menu system. In addition, the menu system itself (the ROMX firmware) is updateable in-system.

What do we mean by In-System Programmable? This simply means that you can re-program ROMX with your own ROM images without removing the device from your computer, and without need for an external IC programmer or hardware. Uploading of new ROM images is done through either the ROMX boot menu, or by running the ROMX.DISK utility from the ROMX floppy disk image. The firmware image is also upgradeable using the same process.

ROMX firmware v0.963 onwards supports linking of a ROM image with a DOS image loaded into a ROM slot. When a ROM image is linked to a DOS image, DOS will be loaded the instant the ROM is selected! This can be a real time saver.

If you purchase the optional ROMX text ROM bundle (bundle sold standard from ReActiveMicro), one of 16 text ROMs (fonts) can be selected from the ROMX menu also, or associated with a specific system ROM.

ROMX is preloaded with a number of ROM images including basic diagnostics.


On October 21st, 2020 Joe's Computer Museum posted an update review video of the ROMX adapter.

Joe's Computer Museum Update Review

On October 12th, 2020 Joe's Computer Museum posted a review video of the ROMX adapter.

Joe's Computer Museum Review

Install Guide And Manual[edit]

Here is everything you need to know about installing and using the ROMX.