Here are two harddisk images of my machines, one focuses primarily on GEM, the other one on Windows (2.1). The Windows machine is also one of my biggest emulation/preservation blunders ... I backed up my uncle's PC-D (which has been scrapped in the meantime *aargh*), but didn't create a boot disk.
So for the moment, the disk image boots DOS 3.1. I still hope that some unlabeled floppy in my basement boots DOS 3.2 on the PC-D ... https://dl.dropboxusercontent.com/u/55419307/Siemens%20PC-D/b6188-pcd-gem.rarhttps://dl.dropboxusercontent.com/u/55419307/Siemens%20PC-D/b6188-pcd-gem.rar