Editing PDP-11 (section)

=== Q-bus models ===
[[File:DEC LSI11-23.jpg|thumb|A PDP–11/03 with cover removed to show the CPU board, with memory board beneath (Two of the CPU chipset's four 40-pin packages have been removed, and the optional [[Floating-point unit|FPU]] is also missing.)]]

The following models use the [[Q-Bus]] as their principal bus:
* PDP–11/03 (also known as the LSI-11/03) – The first PDP–11 implemented with [[Integrated circuit#LSI|large-scale integration]] ICs, this system uses a four-package [[MCP-1600]] chipset from Western Digital and supports 60&nbsp;KB of memory.
* {{visible anchor|PDP-11/23}} – Second generation of LSI (F-11). Early units supported only 248&nbsp;KB of memory.
* PDP–11/23+/MicroPDP–11/23 – Improved 11/23 with more functions on the (larger) processor card. By mid-1982, the 11/23+ supported 4 MB of memory.<ref>{{cite magazine |magazine=Hardcopy |date=October 1982 |page=9 |title=TSX-Plus: Time Share RT-11}}</ref>
* [[PDP-11/73|MicroPDP–11/73]] – The third generation LSI-11, this system uses the faster "Jaws-11" ([[DEC J-11|J-11]]) chip set and supports up to 4&nbsp;MB of memory.
* MicroPDP–11/53 – Slower 11/73 with on-board memory.
* MicroPDP–11/83 – Faster 11/73 with PMI (private memory interconnect).
* MicroPDP–11/93 – Faster 11/83; final DEC Q-Bus PDP–11 model.
* KXJ11 – Q-Bus card (M7616) with PDP–11 based peripheral processor and DMA controller. Based on a J11 CPU equipped with 512&nbsp;KB of RAM, 64&nbsp;KB of ROM, and parallel and serial interfaces.
* [[Mentec#M100|Mentec M100]] – Mentec redesign of the 11/93, with J-11 chipset at 19.66&nbsp;MHz, four on-board serial ports, 1-4&nbsp;MB of on-board memory, and optional FPU.
* [[Mentec#M11|Mentec M11]] – Processor upgrade board; microcode implementation of PDP–11 instruction set by Mentec, using the TI 8832 ALU and TI 8818 microsequencer from [[Texas Instruments]].
* [[Mentec#M1|Mentec M1]] – Processor upgrade board; microcode implementation of PDP–11 instruction set by Mentec, using [[Atmel]] 0.35&nbsp;[[Micrometre|μm]] [[Application-specific integrated circuit|ASIC]].<ref>{{cite web |url=http://www.fuse-network.com/fuse/demonstration/30/24675/24675.pdf |title=Development Project Report |access-date=2014-04-14 |url-status=dead |archive-url=https://web.archive.org/web/20160412201307/http://www.fuse-network.com/fuse/demonstration/30/24675/24675.pdf |archive-date=2016-04-12 }}</ref>
* Quickware QED-993 – High performance PDP–11/93 processor upgrade board.
* DECserver 500 and 550 LAT terminal servers DSRVS-BA using the KDJ11-SB chipset
[[File:DEC-PDT-11-150.jpg|thumb|The PDT-11/150 smart terminal system had two 8-inch floppy disc drives.]]