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DACS: Physical Specifications
 
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Physical Specifications

The Pbus is physically built around commonly available 20-pin DIP headers, ribbon cable and insulation displacement connectors (IDC). The pinouts are depicted in figure 34. Note the presence of a single ground pin. Slaves on the Pbus shall not use this as a ground; it is present to simplify connection of an external bus snooper.

Figure 34: DACS Pbus , physical description. A standard 0.100 inch DIP header of 20 pins shall be used to connect each PC board to the bus. The bus itself shall be carried on 20 conductor ribbon cable, with each PC board connection made via a 20 conductor IDC. All signals are standard TTL levels.
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20 & addx 6 & out\\
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Typical $\mu$C connection to the Pbus shall be made via a few byte-wide I/O ports, a peripheral I/O controller such as the venerable Intel 8255, or through a piece of programmable logic. With 7 bits of address space and a byte-wide data bus, there exist 128 input and 128 output ports in this bus. I/O maps are given for the control board and mixer unit in a later section.
next up previous contents
Next: Timing and Levels Up: Digital Control Bus Previous: Digital Control Bus   Contents
Steve Richardson 2000-07-06
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