There are at least 3 firmware versions. The year & checksum can be displayed by pressing f0 on numeric keypad (within the multiface toolkit main menu). The checksum is calculated by XORing all bytes in the ROM with each other.
*Original AMSDOS:** [[Media:Multiface.two.romantic.robot.86.zip]] - ROM image (1986, chksum=86h) (for original AMSDOS)** [[Media:Multiface.two.romantic.robot.3e.amsdos.v05.zip]] - ** [[Media:Multiface.two.romantic.robot.0e.zip]] - ROM image (1988, chksum=0Eh) (for original AMSDOS)** [[Media:Multiface.two.romantic.robot.78.amsdos.v05.zip]]** [[Media:Multiface.two.romantic.robot.8d.amsdos.v05.zip]]* For the Amstrad Plus series:
* [[Media:Multiface.two.romantic.robot.8b.zip]] - ROM image (1990, chksum=8Bh) (for CPC Plus AMSDOS)
* [[Media:Multiface.two.romantic.robot.78.amsdos.v07.zip]]
[[file:Multiface.two.romantic.robot.78.amsdos.v07.zip]]
Differences between chk=86 and chk=0E versions are unknown. The chk=0Eh and chk=8Bh versions are almost byte-identical, they differ only by some bytes related to the new AMSDOS version used in CPC Plus system cartridge (aside from the new AMSDOS version, there is no support for CPC Plus related features, like handling the new ASIC registers).