Datel Action Replay ROM Versions
ROM version information for the Datel Action Replay and clones.

Note that I'm not sure where we stand with Datel Electronics, hence it is questionable whether the ROM images are avilable for (non profit) distribution. The situation is further confused by the various Action Replay clones that were once available, including the recent Retro Replay flash based cartridge that is compatible with Datel's Action Replay code.

Hardware
As I understand it, the Action Replay cartridges are identified by the Mark revision (e.g. Mk IV, Mk V, Mk VI) and operating system version (e.g. v4.0, v4.1).

The known revisions and operating systems are as follows:

Mk IV v4.0
Mk IV v4.1
Mk IV v4.2 PROFESSIONAL
...
Mk VI v6.0
Sometime after V4.1 an external 8k byte SRAM is fitted to the