| slovo | definícia |
mapped
(encz) | mapped,zmapovaný luke |
Mapped
(gcide) | Map \Map\, v. t. [imp. & p. p. Mapped; p. pr. & vb. n.
Mapping.]
To represent by a map; -- often with out; as, to survey and
map, or map out, a county. Hence, figuratively: To represent
or indicate systematically and clearly; to sketch; to plan;
as, to map, or map out, a journey; to map out business.
[1913 Webster]
I am near to the place where they should meet, if
Pisanio have mapped it truly. --Shak.
[1913 Webster] |
| | podobné slovo | definícia |
unmapped
(encz) | unmapped,nezmapovaný adj: Zdeněk Brož |
Mapped
(gcide) | Map \Map\, v. t. [imp. & p. p. Mapped; p. pr. & vb. n.
Mapping.]
To represent by a map; -- often with out; as, to survey and
map, or map out, a county. Hence, figuratively: To represent
or indicate systematically and clearly; to sketch; to plan;
as, to map, or map out, a journey; to map out business.
[1913 Webster]
I am near to the place where they should meet, if
Pisanio have mapped it truly. --Shak.
[1913 Webster] |
unmapped
(wn) | unmapped
adj 1: (of unknown regions) not yet surveyed or investigated;
"uncharted seas" [syn: chartless, uncharted,
unmapped] |
bitmapped display
(foldoc) | bitmap display
bitmapped display
A computer output device where each pixel
displayed on the monitor screen corresponds directly to one
or more bits in the computer's video memory. Such a
display can be updated extremely rapidly since changing a
pixel involves only a single processor write to memory
compared with a terminal or VDU connected via a serial
line where the speed of the serial line limits the speed at
which the display can be changed.
Most modern personal computers and workstations have
bitmap displays, allowing the efficient use of {graphical user
interfaces}, interactive graphics and a choice of on-screen
fonts. Some more expensive systems still delegate graphics
operations to dedicated hardware such as {graphics
accelerators}.
The bitmap display might be traced back to the earliest days
of computing when the Manchester University Mark I(?)
computer, developed by F.C. Williams and T. Kilburn shortly
after the Second World War. This used a storage tube as its
working memory. Phosphor dots were used to store single
bits of data which could be read by the user and interpreted
as binary numbers.
[Is this history correct? Was it ever used to display
"graphics"? What was the resolution?]
(2002-05-15)
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direct mapped cache
(foldoc) | direct mapped cache
A cache where the cache location for a given
address is determined from the middle address bits. If the
cache line size is 2^n then the bottom n address bits
correspond to an offset within a cache entry. If the cache
can hold 2^m entries then the next m address bits give the
cache location. The remaining top address bits are stored as
a "tag" along with the entry.
In this scheme, there is no choice of which block to flush on
a cache miss since there is only one place for any block to
go. This simple scheme has the disadvantage that if the
program alternately accesses different addresses which map to
the same cache location then it will suffer a cache miss on
every access to these locations. This kind of {cache
conflict} is quite likely on a multi-processor. See also
fully associative cache, set associative cache.
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memory mapped i/o
(foldoc) | memory mapped I/O
The use of the same instructions and bus to
communicate with both main memory and input/output
devices. This is in contrast to processors that have a
separate I/O bus and special instructions to access it.
The I/O devices are addressed at certain reserved address
ranges on the main memory bus. These addresses cannot
therefore be used for RAM. Motorola and Mostec
architectures, among others, use memory mapped I/O.
Video cards and other cards with on-board memory might be
accessed in this way though the term applies not just to
devices containing memory but to any device connected to the
memory bus. Accessing the devices usually consists of reading
and writing certain built-in registers though sometimes the
mere presence of a particular address can trigger the device.
(1997-04-14)
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