DW750 Second Unibus Interface

The DW750 Second Unibus Interface was an optional extra UNIBUS adapter for the VAX-11/750; it connected to the CPU/Memory Interconnect (CMI). It was very similar to the UI750, but did not contain the additional functionality (console, etc) of the UI750.

It was implemented on one extended hex card, the L0010 Unibus Adapter (UBA or SUB), which mounted in the VAX-11/750 backplane in one of the three CMI option slots. A VAX-11/750 could have up to one DW750 Second Unibus Interface.

Additional reading

• VAX Hardware Handbook (1980-81) (EB-17281-20) - the DW750 is covered in some detail in Chapter 9, pp. 157-174

External links

• VAX Hardware Handbook Volume 1 - the DW750 is covered in Chapter 11 (pp. 428-451 of the PDF)
• VAX-11/750 Installation Manual (EK-SI75F-IN-001) - the DW750 is covered in Chapter 5 (pp. 103-112 of the PDF)
• VAX Maintenance Handbook VAX-11/750 (EK-VAXV3-HB-001) - the layout of the DW750 is given on pg. 62 (pg. 74 of the PDF), and a block diagram on pg. 176 (pg. 188)
• L0010 (UBA) - DW750 Secondary Unibus Interface image