The LSI-11, first shipped in the Fall of 1975, was DEC's first cost-reduced PDP-11 CPU, introducing the QBUS, and using the LSI-11 chip set. It was the first of the LSI-11 CPUs ; it had the same QBUS limitations, and use of ODT for control, as the others.

The LSI–11 (PDP–11/03), introduced in February 1975 [9] is the first PDP–11 model produced using large-scale integration; the entire CPU is contained on four LSI chips made by Western Digital (the MCP-1600 chip set; a fifth chip can be added to extend the instruction set).

The Q-bus, [1] also known as the LSI-11 Bus, is one of several bus technologies used with PDP and MicroVAX computer systems previously manufactured by the Digital Equipment Corporation of Maynard, Massachusetts. The Q-bus is a less expensive version of Unibus using multiplexing so that address and data signals share the same wires. [2]

The LSI-11 module abandoned the Unibus in favor of a simpler structure, formally known as the LSI-11 bus but always referred to as the Qbus. The LSI-11 consisted of three chips, one of which could be replicated: the microcode ROM (MICROM, …

2016年11月2日 · DEC's LSI-11 was their earliest product with a CPU on a set of large LSI IC's. Based on the PDP-11 instruction set, the LSI-11 used a non-UniBus backplane architecture called "QBus". An early CPU board was a quad-width KD11-F, and the DEC model was 11/03. These were first distributed in 1975.

2017年11月22日 · Today we’ll look at the LSI-11 chip set, the basis of the Pascal. Back in 1974 DEC (Digital Equipment Corporation) contracted Western Digital to design and build a 16-bit chipset to emulate the Bipolar PDP-11/05 Minicomputer.

2015年10月19日 · lsi-11 是第一个使用大型积体电路技术制造的 pdp-11 机型。 整个处理器包含了四个由威腾（Western Digital）所制造的大型积体电路晶片。 而其汇流排是一个类似 Unibus 的Q-Bus，不同点在于位址与资料以多工的方式来共用资料线，而 Unibus 则是使用分别的线路。

The LSI-11 CPUs were DEC 's first cost-reduced PDP-11 CPUs, using a microprocessor (the LSI-11 chip set). They also used a new bus, the QBUS.

The LSI-11 architecture, organization, and implementation are discussed, together with a survey of special features made possible by the processor's microprogrammed nature. A simple interfacing example is presented, and questions of software support are considered.

The LSI-11 was a microprocessor-combo, implemented on a single quad-height board (KD11-F), that used the new LSI-11 bus (later known as the qbus), a (then) 18-bit wide system bus. The LSI-11 chipset was later marketed as "WD-16" by its manufacturer: Western Digital .