UI750 Unibus Interface

The UI750 Unibus Interface was a UNIBUS adapter for the VAX-11/750; it connected to the CPU/Memory Interconnect (CMI). It also provided the asynchronous serial line interface to the system console, and its associated TU58 mass storage device; the system's 'time of year' (ToY) clock; and the system hardware revision level field of the System Identification (SID) register.

It was implemented on one extended hex card, the L0004 Unibus Interface (UBI), which mounts in the VAX-11/750 backplane in a dedicated slot, slot number 4.

See also

• DW750 Second Unibus Interface

Further reading

• VAX Hardware Handbook (1980-81) (EB-17281-20) - the UI750 is covered in some detail in Chapter 9, pp. 157-174

External links

• VAX-11/750 UNIBUS Interface Technical Description (EK-UI750-TD-001)
• VAX Hardware Handbook Volume 1 - the UI750 is covered in Chapter 11 (pp. 428-451 of the PDF)
• VAX Maintenance Handbook VAX-11/750 (EK-VAXV3-HB-001) - the layout of the UI750 is given on pg. 61 (pg. 73 of the PDF), and a block diagram on pg. 174 (pg. 186)
• L0004 (UBI) - UI750 Unibus Interface image