peek
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.)
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