KA410 MicroVAX 2000/VAXstation 2000 System Module

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. [1]

KA410 MicroVAX 2000/VAXstation 2000 System Module

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

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

[1] VAXstation 2000 and MicroVAX 2000 Technical Manual. EK-VTTAA-TM.001

External links

• VAX 2000 - documentation at Bitsavers
  • VAXstation 2000 and MicroVAX 2000 Technical Manual (EK-VTTAA-TM-001)