GEORAM is a 512K memory expansion unit made by Berkeley Softworks for use with GEOS. It can also be used for other programs, but is not compatible with Commodore REU. There are several programs that support GEORAM though, for example Maniac Mansion GOLD.

The Shareware PLUS Commodore 64 & 128 Blog has redesigned the GEORAM to fit inside a standard cartridge case and it does not require a heavy duty powersupply like the Commodore REU would. You can find the new GEORAM at The Shareware PLUS Commodore 64 & 128 Blog

 
 


The new GEORAM comes with a box and a manual.

 
 


Just for comparison. The original geoRAM to the left is very bulky and the PCB had to be exposed so it would fit into the C128D. I was always afraid to break something by mistake when handling the geoRAM. The new design is much better.

 
 


Contents of the original geoRAM and the new GEORAM.