Technical information

1.6 KA660–AA-BA CPU Specifications
The VAX 4000 Model 200 system (in a BA430 enclosure and in a BA215
enclosure) uses the KA660–AA central processing unit. The VAXserver
4000 Model 200 (in a BA430 enclosure and in a BA215 enclosure) uses the
KA660–BA central processing unit.
Central Processing Unit
Addressing modes General register: 8
Clock rate 114 MHz
Data path width 64 bits
Number of data types Hardware: 9
Software emulated: 7
Number of instructions Hardware: 272
Software emulated: 32
General purpose registers 16 (32-bit wide)
Program counter: 4
Index: 9
PDP–11 compatibility mode Emulated in software
Time bases Time-of-year clock: 1 (battery backup)
Interval timer: 1 (10 milliseconds)
Programmable timers: 2
I/O bus interface One Q22-bus interface with 8192 entry map
Backplane termination 240
Memory Management and Control
Page size 512 bytes
Virtual address space 4 Gbytes
Physical memory space 512 Mbytes
Number of memory modules 4 maximum
Base System Description 1–15