There are two copies of SystemBus, both paralely conected. Either one, or both may be used to stack with other PCBs like retrocomputer or another cards together. I will use female/male connectors (socket with long legs) in the inner position, but it is also possible to use pins downwards and socket upwards, alternation positions, if the F/M connectors are ont available or practical.

The SystemBus contains the usual common power, 8bits Data and 16bits Address, then communication with GLUE divided to A and B parts and rest of pins is reserved for signals (like MasterReset).

MasterReset is used for reseting all connected PCBs, while normal Reset resets only this PCB without affecting others.

|SystemBus-schema.png|

|SystemBus-side.png| view from side with sockets in outer and pins in inner holes