peek

Command in Commodore BASIC used to fetch a value from memory. Using this, you could write a complete joystick driver in less than 20 lines of code or check if the motor in the tape drive was running!

peek n.,vt.

(and poke) The commands in most microcomputer BASICs for directly accessing memory contents at an absolute address; often extended to mean the corresponding constructs in any HLL (peek reads memory, poke modifies it). Much hacking on small, non-MMU micros used to consist of `peek'ing around memory, more or less at random, to find the location where the system keeps interesting stuff. Long (and variably accurate) lists of such addresses for various computers circulated (see interrupt list). The results of `poke's at these addresses may be highly useful, mildly amusing, useless but neat, or (most likely) total lossage (see killer poke).

Since a real operating system provides useful, higher-level services for the tasks commonly performed with peeks and pokes on micros, and real languages tend not to encourage low-level memory groveling, a question like "How do I do a peek in C?" is diagnostic of the newbie. (Of course, OS kernels often have to do exactly this; a real kernel hacker would unhesitatingly, if unportably, assign an absolute address to a pointer variable and indirect through it.)

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

Peek (?), v. i. [OE. piken: cf. F. piquer to pierce, prick, E. pique. Cf. Peak.]

To look slyly, or with the eyes half closed, or through a crevice; to peep.

© Webster 1913.