The LSI-11 is a Q16 device; it only drives 16 address lines. Although it can be plugged into a Q18 or Q22 backplane, it will only function with Q16 main memory. (With Q22 memory, the pins used for BDAL18-21 are used for other, internal signals by the LSI-11. The reason for the incompatability with Q18 memory is currently unknown.)
The usual CPU options were available for the LSI-11: the KEV11-A, for the EIS/FIS instructions; the KEV11-B provides EIS without FIS; the KEV11-C provides a subset of the PDP-11 CIS (it also apparently includes the EIS, but not the FIS).
It also supported the optional KUV11 Writeable Control Store.
Many different LSI-11 models exist, including the KD11-F and KD11-H base versions, and numerous other variants. The KD11-F version includes 4KW of MOS RAM on-board; the KD11-H version has the RAM deleted.
Others included various KEV11 chips pre-installed:
- the KD11-L is a KD11-F with a KEV11-A
- the KD11-N is a KD11-H with a KEV11-A
- the KD11-P is a KD11-F with a KEV11-C
- the KD11-Q is a KD11-H with a KEV11-C
Some models include additional cards:
- the KD11-J is a KD11-H sold with an MMV11-A QBUS core memory card
- the KD11-R is a KD11-H sold with an MSV11-C QBUS MOS memory card
|v • d • e PDP-11 Computers and Peripherals|
| Unibus PDP-11s - PDP-11/20 • PDP-11/15 • PDP-11/35 • PDP-11/40 • PDP-11/45 • PDP-11/50 • PDP-11/55 • PDP-11/70 • PDP-11/05 • PDP-11/10 • PDP-11/34 • PDP-11/04 • PDP-11/44 • PDP-11/60 • PDP-11/24 • PDP-11/84 • PDP-11/94
Clones: CM 1420