How many registers should the PDP-11 have?

The CPU contains eight general-purpose 16-bit registers (R0 to R7).

Is PDP-11 byte addressable?

The PDP-11 is a byte addressed machine but it has a 16 bit data bus. If you issue a word read to address 100, it will return you the two bytes at 100 and 101. The PDP-11 is little endian so the byte at 100 is the low byte.

How much RAM did the PDP-11 have?

4 MB
PDP-11/70 ā€“ 1975. The 11/45 architecture expanded to allow 4 MB of physical memory segregated onto a private memory bus, 2 kB of cache memory, and much faster I/O devices connected via the Massbus.

What does PDP-11 stand for?

Programmed Data Processor-11
PDP-11 (Programmed Data Processor-11) is one of the most famous computers in computing history, one of a series manufactured by Digital Equipment Corporation ( DEC ) from the early 1960s through the mid-1990s.

How many registers should the PDP 10 have?

There are 16 general-purpose, 36-bit registers. The right half of these registers (other than register 0) may be used for indexing. A few instructions operate on pairs of registers.

What is the maximum physical address on a PDP 11?

The PAR contains the base physical address for the segment (in units of 0100/64. bytes). On machines which have only UNIBUS memory (e.g. PDP-11/40, PDP-11/45, etc) these registers are 12 bits long, since the maximum amount of physical memory on these machines is 248 Kbytes.

Who invented PDP-11 computer?

Digital Equipment Corporation

It seems however that the designed by de Castro PDP-X has little relationship to DEC’s eventual 16-bit architecture, the PDP-11. Gordon Bell, the vice president of research in DEC, was involved with recommending what became the PDP-11, while the actual design was made by Harold McFarland.

Who created the PDP-11?

The last machine marketed under the name “PDP” was the -16 in 1972. After the success of the PDP-8, leading hardware engineer Edson DeCastro designed a 16-bit machine under the codename “PDP-X”, which was rejected in favor of another machine, to be known as the PDP-11. DeCastro parted with DEC, and formed Data General.

What is the meaning of PDP-8?

The PDP-8 is a 12-bit minicomputer that was produced by Digital Equipment Corporation (DEC). It was the first commercially successful minicomputer, with over 50,000 units being sold over the model’s lifetime.

How much memory did a PDP 10 have?

with a capacity of 32 to 256 kWords of magnetic core memory (the picture on the right hand side of the introduction shows six of these cabinets). The processors used in the DECSYSTEM-20 (2040, 2050, 2060, 2065), commonly but incorrectly called “KL20”, use internal memory, mounted in the same cabinet as the CPU.

Who invented IBM 4341?

the intermediate systems group
The IBM 4341 Model 2 was developed by the intermediate systems group, and manufactured by SPD, in Endicott. Subsequent processors had development and manufacturing activities in Endicott, Havant, Boeblingen, Valencia, and Sumare.

Which type of computer is PDP-8?


A PDP-8 on display at Bletchley Park in Bletchley, England. This example is from the first generation of PDP-8s, built with discrete transistors and later known as the Straight 8.
Developer Digital Equipment Corporation
Product family Programmed Data Processor
Type Minicomputer
Release date March 22, 1965

What are the instructions in the 8051 instruction set?

8051 Instruction Set An instruction is a command given to the microcontroller for performing a specified operation on presented data. The instruction set of microcontroller is a collection of instructions that the microcontroller is designed to execute. Data moving or handling Instructions:

What kind of instruction set does the PDP-11 have?

The instruction set of the PDP-11 was designed towards a clean, general, symmetric instruction set. It can be used as a register-based, stack-based, or memory-based machine, depending on the programmer’s preferences.

What is the Atmel 8051 microcontroller instruction set?

Section 1 8051 Microcontroller Instruction Set Atmel 8051 Microcontrollers Hardware 1 0509Cā€“8051ā€“07/06 Section 1 8051 Microcontroller Instruction Set For interrupt response time information, refer to the hardware description chapter. Note: 1.

When to use jump and loop in 8051?

Loop and Jump Instructions: Looping operation in the 8051: On repeating a sequence of instructions a certain number of times will result in the formation of loop. The looping operation is used for running the same set of subroutine inside a program number of times as per the requirement.