The correct answer is D. large memory and a high-speed processor & a mouse and a specialized keyboard.
LISP machines are a type of computer that are designed to run the LISP programming language. They are typically characterized by their large memory and high-speed processor, as well as their use of a mouse and a specialized keyboard.
Large memory is important for LISP machines because LISP programs are often very complex and require a lot of storage space. A high-speed processor is also important for LISP machines because LISP programs can be very computationally intensive.
A mouse is used to interact with the LISP environment, and a specialized keyboard is used to enter LISP code. The mouse allows the user to select objects and move them around the screen, while the specialized keyboard allows the user to enter LISP code quickly and easily.
Here is a brief explanation of each option:
- Option A: large memory and a high-speed processor. This is the most important feature of a LISP machine. LISP programs are often very complex and require a lot of storage space. A high-speed processor is also important for LISP machines because LISP programs can be very computationally intensive.
- Option B: letter-quality printers and 8-inch disk drives. These are not essential features of a LISP machine. Letter-quality printers are not necessary because LISP programs can be printed on any type of printer. 8-inch disk drives are not necessary because LISP programs can be stored on any type of storage device.
- Option C: a mouse and a specialized keyboard. These are important features of a LISP machine. A mouse allows the user to interact with the LISP environment, and a specialized keyboard allows the user to enter LISP code quickly and easily.