The correct answer is D. both (a) and (c).
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 necessary for running LISP programs, which can be very complex. The high-speed processor is necessary for executing the instructions in these programs quickly. The mouse and specialized keyboard are used to interact with the LISP environment, which is different from the environment used for other programming languages.
Letter-quality printers and 8-inch disk drives are not essential features of LISP machines. They may be included on some machines, but they are not required.
Here is a brief explanation of each option:
- A. large memory and a high-speed processor
LISP machines are typically characterized by their large memory and high-speed processor. This is because LISP programs can be very complex, and they require a lot of memory to run. The high-speed processor is necessary for executing the instructions in these programs quickly.
- B. letter-quality printers and 8-inch disk drives
Letter-quality printers and 8-inch disk drives are not essential features of LISP machines. They may be included on some machines, but they are not required.
- C. a mouse and a specialized keyboard
The mouse and specialized keyboard are used to interact with the LISP environment, which is different from the environment used for other programming languages. The mouse is used to select items on the screen, and the specialized keyboard is used to enter commands.
- D. both (a) and (c)
The correct answer is D. both (a) and (c). LISP machines are typically characterized by their large memory and high-speed processor, as well as their use of a mouse and a specialized keyboard.
- E. None of the above
The correct answer is D. both (a) and (c).