User guide

4
Hardware Options
This chapter describes the hardware options of VAX 4000 Model 105A/106A
systems. It also describes how to connect the external hardware options to the
system. It includes information on the following topics:
• Internal hardware options
• External hardware options
• Connecting a SCSI expansion box
• Connecting peripherals
Note
Illustrations in this manual show the VAX 4000 Model 106A system
rather than the Model 105A system unless otherwise noted.
4.1 Internal Hardware Options
The system supports the following internal hardware options:
• MS44L-BC 16Mbytes set (4XMS44L-AA) and MS44-DC 64MB set
(4XMS44-CA) memory modules—Model 105A/106A systems do not
have any memory on the system board. They use only MS44L-BC and
MS44-DC memory module bundles. You can increase the memory capacity
of a Model 105A/106A system up to a maximum of 128MB in 16MB or
64MB increments using a maximum of two memory sets.
• Synchronous communications options—The system supports the
DSW42-AA synchronous communications option. This communications
option provides two synchronous communications ports and allows you
to connect the system to a peripheral that uses an EIA-232 (V.24) 25-pin
connector. You can use other interface standards with this option if you
order different cables. Table 4–1 lists each interface standard and the part
number of the corresponding cable.
Hardware Options 4–1