Posted by: "john_elliott, March 2012, in an "Apricot" support email list.   

One of my other retrocomputing activities involves the GEM GUI. I've recently disassembled various drivers for the F-Series machines (Portable and F1), and combined them with the published GEM/3 source tree to create updated versions that should work with GEM/3.

They also have the following changes, compared to the Apricot ones I started with:

* Automatic resolution detection: 640x256 versus 640x200. 
* Fixes for the rendering bugs I mention at the bottom of  < http://www.seasip.info/Gem/History/apricot.html >.
* Created a 16-colour driver for the Portable, based on the existing 8-colour driver.
* Support for multiple codepages (when run under MSDOS 3).

The new drivers can be downloaded from < http://www.seasip.info/Gem/drivers3.html >. Disassembled source for the originals is at < http://www.seasip.info/Gem/drivers0.html >. 

The driver pack also includes my experimental GEM/3 driver for the Apricot PC / Xi.