| | podobné slovo | definícia |
C41H64O13
(gcide) | digitoxin \dig`i*tox"in\ (d[i^]j`[i^]*t[o^]k"s[i^]n), n. (Chem.)
A steroid glycoside, one of the cardiotonic chemical
substances which is extracted from the foxglove. It is a
white, crystalline substance (C41H64O13), and is a
3-substituted triglucoside of a steroid, related structurally
to digitalin and digoxin. It is used as a cardiotonic for
treatment of certain heart conditions, such as congestive
heart failure. Chemically it is
(3[beta],5[beta])-3-[(O-2,6-Dideoxy-[beta]-D-ribo-hexopyranosyl-(1[rarr]4)-O-2,6-dideoxy-[beta]-D-ribo-hexopyranosyl-(1[rarr]4)-2,
6-dideoxy-[beta]-D-ribo-hexopyranosyl)oxy]-14-hydroxy-card-20(22)-enolide.
The related compounds digitalin and digoxin are also
extracted from the foxglove (Digitalis lanata and
Digitalis purpurea). The class of steroid glycosides having
cardiotonic properties are refered to as the cardiac
glycoside group. --MI11
[PJC] |
C41H64O14
(gcide) | digoxin \di*gox"in\, n. (Chem.)
a steroid glycoside, one of the cardiotonic chemical
substances which is extracted from the foxglove. It is a
white, crystalline substance (C41H64O14), and is a
3-substituted triglucoside of a steroid, related structurally
to digitalin and digitoxin. It is used as a cardiotonic for
treatment of certain heart conditions, such as congestive
heart failure. Chemically it is
(3[beta],5[beta],12[beta])-3-[(O-2,6-Dideoxy-[beta]-D-ribo-hexopyranosyl-(1->4)-O-2,6-dideoxy-[beta]-D-ribo-hexopyranosyl-(1->4)-2
, 6-dideoxy-[beta]-D-ribo-hexopyranosyl)oxy]-12,14-dihydroxy-card-20(22)-enolide.
The related compounds digitalin and digoxin are also
extracted from the foxglove (Digitalis lanata and
Digitalis purpurea). The class of steroid glycosides having
cardiotonic properties are refered to as the cardiac
glycosides. --MI11
[PJC] |
64th
(wn) | 64th
adj 1: the ordinal number of sixty-four in counting order [syn:
sixty-fourth, 64th] |
atomic number 64
(wn) | atomic number 64
n 1: a ductile silvery-white ductile ferromagnetic trivalent
metallic element of the rare earth group [syn:
gadolinium, Gd, atomic number 64] |
16450
(foldoc) | 16450
A UART with a one-byte FIFO buffer. The 16450
is a higher speed, fixed version of the 8250. It was
superseded by the 16550.
The 16450 was used for the IBM PC AT and PS/2 but will not
work in a IBM PC XT.
(2004-03-21)
|
64-bit
(foldoc) | 64-bit
A term describing a computer architecture with an
ALU,
registers and data bus which handle 64 bits at a time.
64-bit processors were quite common by 1996, e.g. Digital Alpha,
versions of Sun SPARC, MIPS, IBM AS/4000. The PowerPC
and
Intel were expected to move to 64 bits at their next generation -
{PPC
620} and Intel P7.
Being able to deal with 64-bit binary numbers means the
processor can work with signed integers between +-2^32 or
unsigned integers between zero and 2^64-1. A 64-bit {address
bus} allows the processor to address 18 million gigabytes as
opposed to the mere four gigabytes allowed with 32 bits. In
1996 hard disks could already hold over 4 GB. Floating
point calculations can also be more accurate.
A 64-bit OS is needed as well to take advantage of the CPU.
In 1996 there were only a few 64-bit operating systems,
including OS/400, Digital Unix, Solaris (partialy). A
32-bit OS can run on a 64-bit CPU.
(2004-05-12)
|
alpha axp 21164
(foldoc) | Alpha AXP 21164
A 1 GIPS version of the DEC Alpha processor.
The first commercially available sequential 1 GIPS processor.
Announced 1994-09-7.
(http://digital.com/info/semiconductor/dsc-21164.html).
(1995-05-10)
|
base 64
(foldoc) | base 64
A file format using 64 ASCII
characters to encode the six bit binary data values 0-63.
To convert data to base 64, the first byte is placed in the
most significant eight bits of a 24-bit buffer, the next in
the middle eight, and the third in the least significant eight
bits. If there a fewer than three bytes to encode, the
corresponding buffer bits will be zero. The buffer is then
used, six bits at a time, most significant first, as indices
into the string
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
and the indicated character output. If there were only one or
two input bytes, the output is padded with two or one "="
characters respectively. This prevents extra bits being added
to the reconstructed data. The process then repeats on the
remaining input data.
Base 64 is used when transmitting binary data through
text-only media such as electronic mail, and has largely
replaced the older uuencode encoding.
(2004-07-17)
|
c64
(foldoc) | Commodore 64
C64
(C64) An 8-bit Commodore Business Machines
personal computer released around September 1981.
Prototypes were (apparently) made before Christmas 1980 (and
shown at some computer fair).
The CPU was a 6510 from MOS Technology (who were a
wholly owned subsiduary of Commodore at this time(?)). The
C64 had 64 kilobytes of RAM as standard and a 40-column
text, 320x200 pixel display generating composite video,
usually connected to a television.
DMA-based memory expanders for the C64 (and C128) allowed
128, 256, and 512 kb of RAM. Several third party
manufacturers produce accelerators and RAM expanders for the
C64 and C128. (Some, risking a holy war, compare this to
putting a brick on roller-skates). Such accelerators come in
speeds up to 20MHz (20 times the original) and RAM expanders
to 16MB.
The C64's 1541 5.25 floppy disk drive had a 6502
processor as a disk controller.
See also Commodore 65.
["Assembly language programming with the Commodore 64", Marvin
L. De Jong].
(1996-06-05)
|
commodore 64
(foldoc) | Commodore 64
C64
(C64) An 8-bit Commodore Business Machines
personal computer released around September 1981.
Prototypes were (apparently) made before Christmas 1980 (and
shown at some computer fair).
The CPU was a 6510 from MOS Technology (who were a
wholly owned subsiduary of Commodore at this time(?)). The
C64 had 64 kilobytes of RAM as standard and a 40-column
text, 320x200 pixel display generating composite video,
usually connected to a television.
DMA-based memory expanders for the C64 (and C128) allowed
128, 256, and 512 kb of RAM. Several third party
manufacturers produce accelerators and RAM expanders for the
C64 and C128. (Some, risking a holy war, compare this to
putting a brick on roller-skates). Such accelerators come in
speeds up to 20MHz (20 times the original) and RAM expanders
to 16MB.
The C64's 1541 5.25 floppy disk drive had a 6502
processor as a disk controller.
See also Commodore 65.
["Assembly language programming with the Commodore 64", Marvin
L. De Jong].
(1996-06-05)
|
commodore 64dx
(foldoc) | Commodore 65
Commodore 64DX
(Or Commodore 64DX, C65, C64DX) The last 8-bit
computer designed by Commodore Business Machines, about
1989-1991. The C65 boasts an ugly collection of custom
integrated circuits which makes even the Amiga hardware
look standard.
The core of the C65 chipset is the CSG 4510 and {CSG
4569}. The 4510 is a 65CE02 with two 6526 CIAs. The
4569 is equivalent to a combination of the 6569 VIC-II and
the MMU of the Commodore 64. The C65 also has a {DMA
controller} (Commodore's purpose built DMAgic) which also
functions as a simple blitter, and a floppy controller for
the internal Commodore 1581-like disk drive. The floppy
controller, known as the F011, supports seven drives (though
the DOS only supports 2). The 4510 supports all the C64
video modes, plus an 80 column text mode, and bitplane
modes. The bitplane modes can use up to eight bitplanes, and
resolutions of up to 1280 x 400. The palette is 12-bit
like the Amiga 500. It also has two SID's (MOS 8580/6581)
for stereo audio.
The C65 has two busses, D and E, with 64 kilobytes of RAM
on each. The VIC-III can access the D-bus while the CPU
accesses the E-bus, and then they can swap around. This
effectively makes the whole 8MB address space both {chip
ram} and fast ram. RAM expansion is accomplished through
a trap door slot in the bottom which uses a grock of a
connector. The C65 has a C128-like native mode, where all
of the new features are enabled, and the CPU runs at 3.5
megahertz with its pipeline enabled. It also has a C64
incompatibility mode which offers approx 50-80%
compatibility with C64 software by turning off all its {bells
and whistles}. The bells and whistles can still be accessed
from the C64 mode, which is dissimilar to the C128's
inescapable C64 mode.
Production of the C65 was dropped only a few weeks before it
moved from the Alpha stage, possibly due to Commodore's cash
shortage. Commodore estimate that "between 50 and 10000"
exist. There are at least three in Australia, about 30 in
Germany and "some" in the USA and Canada.
(1996-04-07)
|
commodore sx64
(foldoc) | Commodore SX64
A "portable" Commodore 64. Shaped vaguely like a
seat cushion, this cumbersome experiment in transportable
computers had a detachable keyboard on one end which, when
removed, revealed a 6" monitor and a 5 1/4" floppy disk
drive. The curious combination of a bulky design and
microscopic display are the most likely cause for the SX64's
discontinuation.
[Processor? RAM? Dates?]
(1997-10-25)
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ge-645
(foldoc) | GE-645
A computer built by General Electric, the
successor to the GE-635, designed to provide the extra CPU
features required by the Multics project.
The GE-645 was designed in 1965 by John Couleur and Edward
Glaser at MIT. It had several security levels and
instructions for handling virtual memory. Addressing used
an 18-bit segment in addition to the 18-bit address,
dramatically increasing the theoretical memory size and making
virtual memory easier to support.
Design of the GE-645's successor, the GE-655, started in 1967.
(2006-09-24)
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h.264
(foldoc) | H.264
Advanced Video Coding
AVC
(Or Advanced Video Coding, AVC) A low {bit
rate} visual communication standard used in {video
conferencing}. H.264 was developed by MPEG and ITU-T
VCEG to replace H.263.
{Video and image compression resources and research
(http://www.vcodex.fsnet.co.uk/h264.html)}.
(2007-03-16)
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hitachi hd64180
(foldoc) | Hitachi HD64180
A processor family which adds peripherals and an
MMU to the Zilog Z80.
(1995-10-06)
|
iso 10646
(foldoc) | Universal Character Set
ISO 10646
ISO/IEC 10646-1
UCS
(UCS, ISO/IEC 10646) A 1993 ISO and
IEC standard character set, also known as "Universal
Multiple-Octet Coded Character Set".
UCS comes in a 16-bit variant called UCS-2 and a 32-bit
variant called UCS-4, which is composed of 16-bit UCS-2
"planes". So far only one 16-bit plane has been defined,
which is known as the Basic Multilingual Plane.
The implementation of UCS is still in its infancy, though some
moves, such as the Java language defining a character to be
16 bits, are suggestive.
[Relationship with Unicode?]
(1997-07-04)
|
iso 8649
(foldoc) | Association Control Service Element
ACSE
ISO 8649
ISO 8650
X.217
X.227
(ACSE) The OSI method for establishing a call
between two application programs. ACSE checks the
identities and contexts of the application entities, and could
apply an authentication security check.
Documents: ITU Rec. X.227 (ISO 8650), X.217 (ISO 8649)
(1997-12-07)
|
iso/iec 10646-1
(foldoc) | Universal Character Set
ISO 10646
ISO/IEC 10646-1
UCS
(UCS, ISO/IEC 10646) A 1993 ISO and
IEC standard character set, also known as "Universal
Multiple-Octet Coded Character Set".
UCS comes in a 16-bit variant called UCS-2 and a 32-bit
variant called UCS-4, which is composed of 16-bit UCS-2
"planes". So far only one 16-bit plane has been defined,
which is known as the Basic Multilingual Plane.
The implementation of UCS is still in its infancy, though some
moves, such as the Java language defining a character to be
16 bits, are suggestive.
[Relationship with Unicode?]
(1997-07-04)
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portable commodore 64
(foldoc) | Portable Commodore 64
A version of the Commodore 64 modelled after the
original Osborne portable PCs, with a flip-down keyboard that
revealed a 5-inch colour monitor, and a built-in 1541 {floppy
disk} drive. It is thought that few were made but that they
did go on sale, at least in Canada.
[Relationship to Commodore 65?]
(1997-09-14)
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rfc 2364
(foldoc) | RFC 2364
The RFC defining PPPoA.
(rfc:2364).
(2007-06-15)
|
ultra64
(foldoc) | Ultra64
A Nintendo games machine, unveiled in May
1995.
[Details?]
(1995-05-10)
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c64
(vera) | C64
Commodore 64 [computer] (Commodore)
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em64t
(vera) | EM64T
Extended Memory [64] Technology (Intel)
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i32lp64
(vera) | I32LP64
Integer 32 [bit], Long and Pointer 64 [bit] (BIT)
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ia64
(vera) | IA64
Intel Architecture - 64 [BIT] (Intel, BIT), "IA-64"
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il32p64
(vera) | IL32P64
Integer and Long 32 [bit], Pointer 64 [bit] (BIT)
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llp64
(vera) | LLP64
Long [32 bit], Long [32 bit], Pointer 64 [bit] (BIT)
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p64
(vera) | P64
Pointer 64 [bit] (BIT)
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stm64
(vera) | STM64
Synchronous Transport Mode 64 [9953,28 Mbps] (ATM, STM, SDH,
OC-192), "STM-64"
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