VAX-11/750

VAX-11/750
VAX-11/750
Codename:	Comet
Year Introduced:	October 1980
RAM:	Max of 14 MB
VUPS:	0.65

The VAX-11/750 (also known as the VAX/750) is a slower, more compact, but less expensive version of the VAX-11/780. It was built around the CPU Memory Interconnect; major subsystems were:

• KA750 CPU
  • UI750 UNIBUS Interface
  • FP750 Floating-Point Accelerator (optional)
• MS750 Memory System
• RH750 Massbus Adapter
• CI750 Computer Interconnect Interface

It was codenamed 'Comet' by DEC. One of the first OS's available for the 750 was 4.1 BSD. According to 'Quarter Century of UNIX', the DoD could purchase 6 750's for about $150,000 USD.

Some VAX-11/750 Pictures

View into a VAX-11/750 card cage

Left of card cage:

• Top: 54-13489 - TU58 controller
• Bottom: H7112 - VAX-11/780 / VAX-11/750 Battery Backup Unit

Inside card cage:

• Left: DD11-DK - Unibus Backplane (with cards)
• Center: Memory Backplane (with cards)
• Right: CMI Backplane (with cards)

View of VAX-11/750 backplanes from behind

Backplanes:

• Left: CMI Backplane
• Center: Memory Backplane
• Right: DD11-DK - Unibus Backplane

Lower left corner: 5V and 2.5V Power Supply cables (as thick as a finger!)

Bottom: 5V and 2.5V Power Supplies

VAX-11/750 Power Supply Units

• Left: H7104-C 2.5V, 85A
• Right: H7104-D 5V, 135A

See also

• VAX-11/750 & VAX-11/751 Revision Control
• VAX-11/751

External links

• VAX Hardware Handbook Volume 1 - the VAX-11/750 is covered in Chapter 4 (pp. 154-171 of the PDF)
• VAX Maintenance Handbook: VAX-11/750 (EK-VAXV3-HB-001)
• VAX/750 - documentation at Bitsavers
  • 11/750 Field Maintenance Print Set (MP01377)
• Vax 11/750 Frequently Asked Questions
• VAX-11/750
• Makings of a Comet: The VAX 11/750