The Multicomp Cyclone II-C

Posted by musovern on May 7th, 2018 in MultiComp Board, Single Board Computers | 0 comments

The Multicomp Cyclone II-C (v1.10) is a motherboard which provides peripheral connectivity for a Cyclone II FPGA development board commonly available on eBay. The board was designed “by committee” in the retrobrewcomputers forum during December 2015, with James Moxham doing all the actual work (schematic capture and PCB layout). One of the prime motivators for this board was to fit a 10cmx10cm footprint because the manufacturing cost of PCBs of this size is particularly attractive. It provides connectivity for the following peripherals: (v1.10) is a motherboard which provides peripheral connectivity for a Cyclone II FPGA development board commonly available on eBay. The board was designed “by committee” in the retrobrewcomputers forum during December 2015, with James Moxham doing all the actual work (schematic capture and PCB layout). One of the prime motivators for this board was to fit a 10cmx10cm footprint because the manufacturing cost of PCBs of this size is particularly attractive. It provides connectivity for the following peripherals:

 

 

 

• VGA Screen with PS/2 Keyboard interface
• Two RS-232 serial ports:
  • Serial A uses on-board level-shifter and DE-9F connector or external level shifter via 6-pin connector
  • Serial B uses external level shifter via 6-pin connector
• SD Card connector
• Two RAM sockets to support up to 1 MB of RAM.
• 5-pin connector for external DS1302 real-time clock and backup coin cell
• 3V3 or 5V power option for PS/2 Keyboard, with voltage clamp diodes.
• 3 LEDs
• RCA Video connector
• Jumpers for reset and for boot control
• Debug/Expansion headers for data bus and uncommitted FPGA pins

Due to the header installation on the Cyclone II module, the module is required to be mounted inverted onto the motherboard.

The photo in this section shows my build configuration using PS/2 keyboard and VGA output;  SDcard, 1 external RAM, and  serial port with real-time clock

 

On the SD Card is CP/M3 and CP/M 2.2c

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