Document:Q9653
From Rhizome Artbase
With the ‘Retro Replay’ cartridge for C64 we gain full access to the RAM of the C64 to manipulate graphics and functionality. The blue screen that appears at some points is the interface of the cartridge and the lists of letters and numbers is the data in the RAM. All manipulation was made by putting random symbols into the memory or by altering the screen graphically with PETSCII.