I have another dump from another Zone console, the Zone 3D:
BIOS image: https://www.dropbox.com/s/mletc8ojy8sijny/zone3d.rom.zip?dl=0
SD card image: https://www.dropbox.com/s/2lxn1funxazbw3h/zone3d.img.zip?dl=0
SD card CHD: https://www.dropbox.com/s/tssnyqp8mczg5rq/zone3d.chd.zip?dl=0
The Zone 3D uses the Sunplus SPG293, a relative of the SPG290 used in the Mattel HyperScan. The SPG29x series uses a different instruction set from the earlier Sunplus chips used in the Vii, Wireless 60, Zone 60, V.Smile, etc. (The instruction set used in the SPG29x is called S+core while the earlier instruction set is called µ'nSP.) I suspect the same SPG293 processor or a relative is used in the other Wireless and Zone consoles yet to be emulated (Wireless Air 60, Wireless, Zone 40, etc.).
This system is surprisingly well-designed for what it is, and quite possibly the best "worst console ever" I have encountered so far. VGA output! An SD card! A chip count of over 3! The chip I believe to be the video processor is labeled 3DVII-VP80 which is particularly amusing, and leads me to believe the Zone series is the true successor to the Chintendo Vii.