View source for KA410 MicroVAX 2000/VAXstation 2000 System Module

== Description ==

There are two versions of the KA410 [[MicroVAX 2000]]/[[VAXstation 2000]] System Module:

* KA410-A: MicroVAX 2000
* KA410-B: VAXstation 2000

The KA410 system module is central to the entire MicroVAX 2000/VAXstation 2000 computer system. 
It is a printed circuit board mounted on the [[FCC]] shield. 
The system module contains all the control and interface electronics needed to support the [[CPU]] chip, support all I/O for the disks and tapes, support the video subsystem, and support the three option ports (memory, [[Ethernet]] network, and a graphics option port). 
This system module contains 2 megabytes of [[RAM]] and is used in both the VAXstation 2000 and MicroVAX 2000 systems. 
A jumper setting on the system module determines which system it is configured for.
The system jumper sets a bit in the configuration and test [[register]]. [[#ref_1|[1]]]

[[File:KA410_MV2000-VS2000_system_module_top.JPG|400px|thumb|left|KA410 MicroVAX 2000/VAXstation 2000 System Module]]

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The KA410 MicroVAX 2000/VAXstation 2000 System Module contains:

* Central processor ([[DC333]] MicroVAX CPU chip and [[DC337]] MicroVAX FPU chip)
* [[ROM]] memory
* Time-of-Year clock
* DC524 Standard cell
* DC503 Cursor sprite chip
* DC367B Serial line controller
* 9224 Disk controller (up to one diskette drive and two hard disk drives)
* NCR 5380 [[TK50Z]] Tape controller (restricted function [[SCSI]])
* [[ThinWire]] Ethernet circuits ([[Transceiver]] function circuitry)
* Miscellaneous registers

== System ROM Sets == 

There are at least five known System ROM Sets (four ICs 64kx8 27512 each):
* 23-001E7, 23-002E7, 23-003E7, 23-004E7
* 23-033E7, 23-034E7, 23-035E7, 23-036E7
* 23-050E7, 23-051E7, 23-052E7, 23-053E7: ROM V2.1
* 23-092E7, 23-093E7, 23-094E7, 23-095E7: ROM V2.2
* (Order numbers yet unknown): ROM V2.3 is used by the [[SIMH]] microvax2000 simulator

There are probably some changes in ROM functionality, but there is very little known as of yet:
* ROM V2.2 supports the [[MS400 MicroVAX 2000/VAXstation 2000 Memory Module|MS410-CA 12MB Memory Module]]

== Power Requirements ==

The system module requires +12 Vdc, +5 Vdc, and -12 Vdc supplies for operation and a special -9 Vdc for power loading at 180 milliamps for the ThinWire Ethernet transceiver circuits on the system module.

== References ==

 <div id="ref_1">[1] VAXstation 2000 and MicroVAX 2000 Technical Manual. EK-VTTAA-TM.001</div>

==External links==

* [http://www.bitsavers.org/pdf/dec/vax/2000/ VAX 2000] - documentation at [[Bitsavers]]
** [http://www.bitsavers.org/pdf/dec/vax/2000/EK-VTTAA-TM.001_VAXstation_2000_and_MicroVAX_2000_Technical_Manual_Jul1987.pdf VAXstation 2000 and MicroVAX 2000 Technical Manual] (EK-VTTAA-TM-001)

[[Category: DEC Boards]]
[[Category: DEC VAX Processors]]