Technical information

by means of switches or jumpers on the options themselves. Digital service
representatives configure the options when they install them. Your Digital
service representative also determines the proper placement of options
within your system, according to specific guidelines.
3.2 Completing the VAX 4000 Model 200
Configuration Worksheets
To determine what options you can add to your system, you must list the
options currently installed and their power requirements on the appropriate
VAX 4000 Model 200 Configuration Worksheet, provided in Figure 3–1 and
Figure 3–2.
The worksheet in Figure 3–1 is for the BA430 enclosure. All backplane
slots and mass storage devices are powered by the H7874 power supply.
The worksheet in Figure 3–2 is for the BA215 enclosure.
Use the worksheets as follows:
1. In the Module column, list all options and mass storage devices
currently installed in your system, except the controller for the tape
drive. The processor module, one memory module, and the tape drive
has already been entered.
Use the label on the cover panel of each slot to identify the module
installed in that slot.
2. List each RF-series ISE.
3. List the options and mass storage devices you wish to add to your
system.
4. List the controller for the tape drive last.
5. Fill in the power requirements for each module and each mass storage
device. The power requirements for the more common options are listed
in Table 3–1; refer to the option descriptions in Chapter 2 for the power
requirements of additional options.
6. Add each column and make sure the totals do not exceed the specified
limit. As long as the figures are within range, you can probably install
the new option(s).
NOTE: The worksheets are only guides. Confirm your plan with your
Digital sales representative. While certain configurations may be possible,
they may not be recommended due to excessive loads on the system or
difficulties in arranging bus and cable access to all devices.
3–2 VAX 4000 Model 200 Technical Information