Difference between revisions of "KA650 CPU"

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The KA650 CPU module is a [[DEC card form factor|quad]]-height [[QBUS]] [[VAX]] CPU produced by [[DEC]]. [[#ref_4|[4]]]
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The '''KA650''' is the [[Central Processing Unit|CPU]] used in several [[Digital Equipment Corporation|DEC]] [[MicroVAX]], [[VAXserver]], and [[VAXstation]] systems. It is a single [[DEC card form factor|quad]]-height [[printed circuit board|PCB]] which plugs into a [[QBUS]] [[backplane]]. The KA650 module number is '''M7620'''. [[#ref_4|[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]].
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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]].
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There are two versions of the KA650:
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* KA650-A (M7620-A): Time-Sharing CPU
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* KA650-B (M7620-B): Workstation / Server CPU
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The only differences between the two CPUs are the system [[ROM]]s:
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* KA650-A: 23-192E7 and 23-193E7
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* KA650-B: 23-194E7 and 23-195E7
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You need different [[VMS]] software licenses for the two KA650 versions.
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For information on KA650 revisions and compatible options see: [[KA650 Revision Control]].
  
 
==Memory Subsystem==
 
==Memory Subsystem==
  
The KA650 memory subsystem is detailed elsewhere, [[DEC KA650 Memory Subsystem]].
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The KA650 uses a custom [[main memory]] subsystem, the [[KA650 Main Memory System]].
  
== References ==
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<div id="ref_1">[1] "CVAX-based Systems", Digital Technical Journal, Vol 1 No 7, August 1988. </div>
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==References==
<div id="ref_2">[2] VAXcluster Systems. Guidelines for VAXCluster System Configurations. EK-VAXCT-CG-006</div>
 
<div id="ref_3">[3] Field Maintenance Print Set: 650QS Pedestal, BA213. MP-02538-01</div>
 
<div id="ref_4">[4] KA650 CPU Module Technical Manual. EK-KA650-UG.003</div>
 
  
{{semi-stub}}
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<div id="ref_1">[1] ''CVAX-based Systems'', [[Digital Technical Journal]], Vol. 1 No. 7, August 1988</div>
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<div id="ref_2">[2] ''[http://www.vaxhaven.com/images/c/c6/EK-VAXCT-CG-006.pdf VAXcluster Systems - Guidelines for VAXcluster System Configurations]'' (EK-VAXCT-CG-006)</div>
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<div id="ref_3">[3] ''650QS Pedestal, BA213 Field Maintenance Print Set'' (MP-02538-01)</div>
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<div id="ref_4">[4] ''KA650-AA CPU Module Technical Manual'' (EK-KA650-UG-002)</div>
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==External links==
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* [http://www.bitsavers.org/pdf/dec/vax/650/ VAX 650] - documentation at [[Bitsavers]]
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** [http://www.bitsavers.org/pdf/dec/vax/650/EK-KA650-UG-002_KA650-AA_CPU_Module_Technical_Manual_Aug88.pdf KA650-AA CPU Module Technical Manual] (EK-KA650-UG-002)
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* [https://manx-docs.org/collections/antonio/dec/MDS-2000-01/cd1/CLUSTER/VAXCTCG6.PDF VAXcluster Systems: Guidelines for VAXCcuster System Configurations] (EK-VAXCT-CG-006)
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[[Category: VAX QBUS Processors]]

Latest revision as of 07:32, 12 September 2023


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 several DEC MicroVAX, VAXserver, and VAXstation systems. It is a single quad-height PCB which plugs into a QBUS backplane. The KA650 module number is M7620. [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.

There are two versions of the KA650:

  • KA650-A (M7620-A): Time-Sharing CPU
  • KA650-B (M7620-B): Workstation / Server CPU

The only differences between the two CPUs are the system ROMs:

  • KA650-A: 23-192E7 and 23-193E7
  • KA650-B: 23-194E7 and 23-195E7

You need different VMS software licenses for the two KA650 versions.

For information on KA650 revisions and compatible options see: KA650 Revision Control.

Memory Subsystem

The KA650 uses a custom main memory subsystem, the KA650 Main Memory System.

References

[1] CVAX-based Systems, Digital Technical Journal, Vol. 1 No. 7, August 1988
[3] 650QS Pedestal, BA213 Field Maintenance Print Set (MP-02538-01)
[4] KA650-AA CPU Module Technical Manual (EK-KA650-UG-002)

External links