This project implements an open source REU for the Commodore 64.
This is an updated version based on the final hardware design. The hardware consists of two PCBs. A Cyclone II development board uses an Intel EP2C5T144C8N FPGA and provides the FPGA and its configurator. A custom carrier board provides a mechanical and electrical interface for the FPGA board, a card edge connector compatible with the C64, logic level shifters required to convert between the C64 5V signals and the FPGA 3.3V signal levels, interfacing and power for the peripheral items on the PCB, a battery backed RTC, a 256 byte EEPROM, and a full-sized SD card socket.
GeoRAM System 2.0 (64er Magazine - December 1992 Issue, Page 36) is a RAM Disk utility & machine code monitor for the Commodore 64. With this utility you can create a 2015 block storage device that can be used from BASIC 2.0.
After the program loads and runs, it will do a warm reboot. After the reboot, issue SYS 56832 to activate the software. The built-in help can be access by typing "HELP" at the > prompt
Turbo Chameleon 64, Flickerfixer, Turbo, REU (and A LOT more) for the Commodore 64
(German, automatically translated)
The Neoram module is a replica of the Georam extension with battery backup by Nicolas Welte (X1541). This was created in the summer of 2006 and over time became the first small series. The picture (left) shows the first fully equipped version. The maximum expansion with 2MB SRAM expands the memory of the C64 many times over and gives it completely new possibilities.
In the past, the predecessor Georam, as the name suggests, was specially developed for Geos. Geos users can hardly be found today. But that doesn't make the extension useless.
The programming is identical to the Georam and in principle very simple. A 16kB page is selected via banking, from which a 256-byte window is always displayed.
A poster of every extant processor, socket, module, and jack in use by computers today. Comprehensive and impressive. You can even buy a print of it if you want.