Power Requirements — The amount of dc current and watts each option requires. The figures for available power are supplied in the configuration template provided for each 4,3 GB SCSI 3,25" system described in Chapter 1. Bus Loads — The number of ac and dc busloads drawn by each option. The fig- ures for available bus loads are supplied in the configuration template provided for each 4,3 GB SCSI 3,25" system described in Chapter 1. - Priority — The order in which options are placed in the backplane that can affect system performance. For example, the 4,3 GB SCSI 3,25" controller is always configured as the last device in the UNIBUS backplane. Note: Module placement will be done by Manufacturing or by Field Service. I/O Distribution Panel Insert Space — The space in the I/O Distribution Panel located at the back of the system box or expansion cabinet that is used to carry connectors for communications and peripheral devices. Options vary in the number of 4,3 GB SCSI 3,25" inserts of space they require. The number of available in- sert spaces is included in the configuration template provided for each PDP-11 system described in Chapter 1. Once you have selected those options that meet your system requirements, list them in the option column of the configuration template. Refer to the configuring information table that lists the power and space requirements mentioned above, and begin subtracting the figures given for each option from the figures provided in the configuration template.