I have a number screenshots of GEM in action (and some of other programs, and a picture of something completely different!). They are listed below.
Digital Research GEM
The GEM/5 About dialog (Digital Research/GST)
FreeGEM Desktop with Background Image (ARGYLE.BMP from Win 3.1)
FreeGEM/XM and XM/GEM
An earlier version of GEMP3 running under FreeGEM/XM (GEMP3 now displays a message saying something along the lines of "Sorry, you can't run me on XM!")
Other GEM-related Screenshots
In the past, there were some screenshots here that were totally unrelated to GEM. These have now been removed, but if you hunt around a bit, you may find them elsewhere on the site.
More screenshots may be here once I've taken them.
Displaying the FreeGEM/XM DOS menu
I have not found a way of displaying the FreeGEM/XM DOS menu without using DEBUG. Load FreeGEM/XM, choose Enter DOS Commands from the Options menu and run DEBUG. Type in the following:
It will look something like the following:
1E90:0100 xor ax,ax
1E90:0102 int 16
1E90:0104 int 20
Press the PLUS key on the numeric keypad and a menu will appear. To exit DEBUG, press CTRL-C and type Q.
I believe the menu will work without using DEBUG under MS-DOS 5.0, but I have not tried it yet.
Windows 2.0 Paint in the GEM Screenshots?
Why is Microsoft Paint 2.0 in the GEM Screenshot section, you may ask? Compare Microsoft Paint to GEM Paint, and you can see just how much more advanced GEM was compared to Windows at the time. Microsoft Paint didn't even have colour support! Sadly, of course, GEM did not last in the same way Windows has, despite being in many ways far superior to Windows in the early days.