Specifications

Chapter 1
Base System Specifications
MicroVAX 3400 and VAXserver 3400 base system components reside in a
BA213 enclosure,
with a 12-slot backplane. The base system includes a
central processor unit (CPU) module, and one to three memory modules.
The
CPU module resides in slot 1 of the backplane. Memory modules can
reside in slots 2 through 4.
1.1 Base System Operation
Base system operation is based on the KA640 CPU module. The KA640
CPU module has the following components:
• CPU chip with 1 Kbyte of cache
• Floating-Point Accelerator (FPA) chip
• A 4-Mbyte, 400-nanosecond, 39-bit wide memory array
• Memory controller
• Clock registers
• DIGITAL Small Storage Interconnect (DSSI) bus adapter
• Ethernet controller
• Q-bus interface
• Console serial line
• Firmware
The following sections describe the DSSI bus, KA640 firmware, and the
controls on the CPU cover panel.
1.1.1 Digital Small Storage Interconnect (0551)
The Digital Small Storage Interconnect (DSSI) bus is dedicated to mass
storage devices on the MicroVAX 3400 and VAXserver 3400 systems.
Base System Specifications 1-1