Technical information

1.6 KAS70-AAIBA CPU Specifications
The VAX 4000 Model 300 system uses the KA670-AA central processing
unit. The VAXserver 4000 Model 300 uses the KA670-BA central
processing unit.
Central Processing Unit
Addressing modes
Clock rate
Data path width
Number of data types
Number of instructions
General purpose registers
PDP-ll compatibility mode
Time
bases
I/O bus interface
Backplane termination
Memory Management and Control
Page size
Virtual address space
Physical memory space
Number of memory modules
Performance
Instruction prefetch buffer size
On-chip cache
Size
Speed
Associativity
On-board cache
Size
Speed
General register: 8
143 MHz
64 bits
Hardware: 9
Software emulated: 7
Hardware: 272
Software emulated: 32
16 (32-bit wide)
Program counter: 4
Index: 9
Emulated in software
Time-of-year clock: 1 (battery backup)
Interval timer: 1 (10 milliseconds)
Programmable timers: 2
One Q22-bus interface with 8192 entry map
240 n
512 bytes
4 gigabytes
512 Mbytes
4
maximum
12 bytes
2 Kbyte
28 nanoseconds
Direct mapped
128 Kbytes
84 nanoseconds
1-14 VAX 4000 Model 300 Technical Information