KA650 CPU

KA650
Summary
OS support (VMS):	V4.7A or later
OS support (ULTRIX):	ULTRIX V2.2
CPU Details
CPU name (VMS):	KA650
CPU module:	KA650
Module:	M7620 [3]
Number of processors:	1
VMS DCL CPU:	10
VMS DCL XCPU:	1
SID:	0A000005
XSID:	01530101
CPU chip:	78034 (CVAX) [1]
FPU chip:	78132
CPU technology:	CMOS
CPU cycle time:	90ns [4]
Instruction-buffer:	12 bytes [1]
Translation-buffer:	28 entries [1]
Cache:	1KB (90ns) [1]
Backup cache:	64KB (180ns longword, 270ns quadword) [4]
Compatibility mode:	No
Console processor:	CPU
Console device:	None
Firmware version:	V5.3
Console speed:	300 to 38400
Memory
Minimum memory:	8MB
Maximum memory:	64MB
Memory checking:	32 + 7 bit ECC [4]
Memory cycle:	450ns longword, 720ns quadword [4]
I/O
Q-bus:	1 @ 3.3MB/s
Performance
VUPs:	2.7 [2]

The KA650 is the CPU used in DEC's MicroVAX III. It is a single quad-height PCB which plugs into a QBUS backplane. [4]

The KA650 is implemented using the CVAX with floating point instruction support provided by the CFPA, main memory control provided by CMCTL, and various system support functions by the SSC.

Memory Subsystem

The KA650 memory subsystem is detailed elsewhere: DEC KA650 Memory Subsystem.

References

[1] "CVAX-based Systems", Digital Technical Journal, Vol 1 No 7, August 1988.

[2] VAXcluster Systems. Guidelines for VAXCluster System Configurations. EK-VAXCT-CG-006

[3] Field Maintenance Print Set: 650QS Pedestal, BA213. MP-02538-01

[4] KA650 CPU Module Technical Manual. EK-KA650-UG.003