KD32 CPU - Revision history

Jnc: +cat

2022-06-28T04:29:42Z

+cat

Jnc: also called the KA610

2022-06-27T18:30:28Z

also called the KA610

Jnc: Make a separate page and expand some

2022-06-27T18:14:01Z

Make a separate page and expand some

New page

[[File:M7135_DATAPATH.JPG|300px|thumb|rightt|M7135 MicroVAX I Data Path Module (DAP)]]

The '''KD32''' was the [[Central Processing Unit|CPU]] in the [[MicroVAX I]], and its [[workstation]] form, the [[VAXstation I]]. It is [[microcode]]d and [[pipeline]]d, and is contained on two [[DEC card form factor|quad]]-height [[printed circuit board|PCBs]]:

* Data Path Module (DAP) M7135
* Memory Controller Module (MCT) M7136

(The VAXstation I uses a later variant, the '''KD32-AB'''; it uses the M7135-YA instead of the basic M7135. The two differ in which [[floating point]] data formats they support.)

The two modules of the MicroVAX I intercommunicate over the [[CD interconnect]] of the [[QBUS backplanes#Backplane types|H9278-A backplane]], and an [[over the back]] [[flat cable]]; the [[data path]]s there are the Memory Control Bus (MCB - over the CD interconnect) and the Memory Data Bus (MDB - over the flat cable). The KD2 uses the [[QBUS]] as both its [[main memory]] and [[input/output|I/O]] [[bus]].

The KD32 contains:

* An interface to the Q22 bus (supports block mode transfers, and up to four megabytes of memory)
* An 8 KB direct-mapped [[cache]]
* A 512 entry (long-word) [[virtual memory]] translation buffer
* A 10 ms non-programmable interval timer
* An interface to a console [[asynchronous serial line]] (available [[baud rate]]s: 300, 1200, 9600, 19200)
* An 8 KB or 16 KB [[bootstrap]] EPROM
* Interfaces to the front control panel and rear patch panel assembly

==Memory==

[[File:M7136_MCT.JPG|300px|thumb|left|M7136 MicroVAX I Memory Controller Module (MCT)]]

The KD32 uses standard Q22 [[QBUS memories]] (as used in QBUS [[PDP-11]]s).

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==External links==

* [http://www.bitsavers.org/pdf/dec/vax/610/EK-KD32A-TD-002_MicroVAX_I_CPU_Technical_Description_Aug84.pdf MicroVAX I CPU Technical Description] (EK-KD32A-TD-002)

← Older revision		Revision as of 04:29, 28 June 2022
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	* [http://www.bitsavers.org/pdf/dec/vax/610/EK-KD32A-TD-002_MicroVAX_I_CPU_Technical_Description_Aug84.pdf MicroVAX I CPU Technical Description] (EK-KD32A-TD-002)		* [http://www.bitsavers.org/pdf/dec/vax/610/EK-KD32A-TD-002_MicroVAX_I_CPU_Technical_Description_Aug84.pdf MicroVAX I CPU Technical Description] (EK-KD32A-TD-002)
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		+	[[Category: VAX QBUS Processors]]

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 [[File:M7135_DATAPATH.JPG|300px|thumb|rightt|M7135 MicroVAX I Data Path Module (DAP)]]
-The '''KD32''' was the [[Central Processing Unit|CPU]] in the [[MicroVAX I]], and its [[workstation]] form, the [[VAXstation I]]. It is [[microcode]]d and [[pipeline]]d, and is contained on two [[DEC card form factor|quad]]-height [[printed circuit board|PCBs]]:
+The '''KD32''' (also called the '''KA610''') was the [[Central Processing Unit|CPU]] in the [[MicroVAX I]], and its [[workstation]] form, the [[VAXstation I]]. It is [[microcode]]d and [[pipeline]]d, and is contained on two [[DEC card form factor|quad]]-height [[printed circuit board|PCBs]]:
 * Data Path Module (DAP) M7135