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Will all your peripherals connect via RS232?

No. Actually, RS232 ports are peripherals by their own and they are in dedicated rack-mount units separate from the CPU cabinet.

Peripheral connect to the CPU via the external bus (that I called "U-BUS"); as seen from the outside this bus consists of two ribbon cables ended with DB-SUB connectors. Memory, for example, is considered a peripheral since it resides in a dedicated unit connected to the CPU via U-BUS, as everybody else.

Tape controllers will be constructed the same way. They contain dual-port buffers (say for instance 1 KB) occupying a portion of the addressable space (memory mapped) and they interrupt the CPU throughout the U-BUS.

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Project start date: May 13 of 2009