KTJ11-B UNIBUS adapter
The KTJ11-B UNIBUS adaptor is used with the KDJ11-B and KDJ11-E QBUS CPU cards in the special KDJ11 PMI/UNIBUS backplane to add UNIBUS capability to systems built around those cards; the PDP-11/84 and PDP-11/94 systems respectively. It converts the native Private Memory Interconnect (PMI) bus supported by these CPUs to the DEC-standard UNIBUS.
It is a hex-height board (M8191), and can only plug into the special backplane, unique to those systems, which is wired to support it.
Technical details
The KTJ11-B contains a cache, to increase the efficiency of DMA transfers on the UNIBUS; generally, two DMA read cycles on the UNIBUS result in a single PMI bus read operation. The cache contains 32 word-width entries, arranged into 4 independent 8-word sets; the KTJ11-B can thus handle up to 4 simultaneous DMA operations on the UNIBUS efficiently.
External links
- PDP-11/84 System Technical and Reference Manual (EK-1184E-TM-001) - the KTJ11-B is covered on pp. 68-85 of the PDF
- PDP-11 Systems Handbook (EB 29317 41) - the KTJ11-B is covered on pp. 143-147 of the PDF
- 11/84 Field Maintenance Print Set (MP-02015-001) - Contains KTJ11-B Field Maintenance Print Set (MP-02010-01) on pp. 127-156
