Gem was the graphical interface provided with the Amstrad
PC 1640 and 1512 computers, even being XT class computers it was great to
have a mouse and graphical interface.
Now actual information about GEM can be located on this link:
To download GEM and know about the history try:
This is the third disk (green one) spanish version
This is a cool tiger image shown on all manuals
The four disks
Amstrad 1512 with the four disks and manual.