GRAM/4D-D01 - 4MB geoRAM Compatible RAM Expansion for Commodore 64/128
Submitted by GG on Sun, 05/06/2018 - 17:12A new version of this project is available here
The geoRAM is a 512KB memory expansion for the Commodore 64 and 128 designed by Berkeley Softworks for use with GEOS. While not as fast as the Commodore REU due to its lack of DMA capabilities, it still provides a significant performance boost. GRAM/4D is a 4MB geoRAM compatible cartridge based on a two 4Mx4 DRAM devices.