Adria is my second attempt to build a simple computer, based on a WDC65C816 CPU.

Design

The backplane has these functions built in:

• Reset, active low using DS1813+;
• 7V-25V in - 5V out voltage regulator, LM7805 based;
• Clock oscillator with divider (/4);
• One slot for CPU;
• One slot for MMU/memory decoder;
• One slot for ROM;
• 4 available expansion slots;

Specifications

Dimensions:

• 162mm x 95 mm;
• M3 unplated mounting holes;
• Double sided PCB;

Available Signals

Known Issues

• In the current ordered PCBs a trace between pin 8 and 12 of U3 (74HCT74) is missing. In the new revision of the design, this has been corrected.
• In a future revision, I might change the 74HCT74 to 74AC74.