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DPSK <Differential phase deviation irregularity>
Reading: DPS k
Full spelling: Differential Phase Shift Keying
Field:
Network technology > DPSK |
One of mounted systems of the digital modulation system PSK which expresses information with
PSK you use the sine wave which becomes standard and the wave where phase slips, by the fact that another value is allotted to each one plural values sending and receiving you do at one time, but with DPSK there is no reference signal, in order to be able to identify phase, phase of the wave which is sent one ago phase of the following wave is detected in standard. When such as PSK when really it is mounted as DPSK is many.
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DragonBall <Dragon ball>
Reading: Dragon ball
Field:
Microprocessor > RISC > DragonBall |
for PDA series name of the microprocessor. It is the microprocessor of the same company which was used with the personal computer and the like, it improves “68000”, it is the memory controller and something which builds in the I/O interface function and the like of IrDA and the like, cheaply the sheath of price is low electric power consumption and the like feature. In the PDA market it is adopted for many types Palm as beginning. Recently, long time passes from development and high speed also the product which adopts the ARM core of RISC system has appeared in place of 68000
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DRAM
Reading: D ram
Full spelling: Dynamic Random Access Memory
Field:
Semiconductor > memory > RAM > DRAM |
One of semiconductor storage cells. In one kind of RAM which can do reading and writing freely, the circuit which stores electric charge with the condenser and the transistor is used for the storage cell.
Memory of information it is done by electric charge, electric charge with time from the fact that it decreases, has the necessity to do the rewrite for memory retention in every fixed time. When power source of the computer is dropped, memory contents are eliminated.
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DR-DOS <OpenDOS>
Reading: D earl DOS
Full spelling: Digital Research Disk Operating System
Alias:
Novell DOS
Field:
OS > MS-DOS > DR-DOS
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The MS-DOS interchangeability OS which at 8 bits OS “CP/M” the famous Digital Research corporation developed.
The time where CPU of the personal computer is 8 bits OS which most was used was CP/M, but when it is 16 bit times which begin the IBM PC/AT compatible machine, Then the same company abandoned the respective company OS, developed DOS interchangeable OS. This is DR-DOS. First version is sold in 1984, in Germany of the nineties first half market share is conveyed was higher than MS-DOS also.
1992, the Digital Research corporation was purchased at the Novell corporation, also DR-DOS was renamed “Novell DOS”. When 1996, the Caldera corporation separates from the Novell corporation, “OpenDOS” changing name again, it was sold, it was gratuitous and it was released. The Caldera corporation the Caldera Thin Clients corporation of the subsidiary company transferred OpenDOS at the Lineo corporation, again returned to “DR-DOS” and original name in 1998. In 2002 November as for DR-DOS it was sold at the DeviceLogic corporation. |
DRDRAM <Direct RDRAM>
Alias:
Direct ram bus
Field:
Semiconductor > memory > RAM > DRDRAM |
DRAM which adopts the high-speed interface technology Direct Rambus which the Rambus corporation developed. As for bus width 8 bits. To 800MHz (400MHz DDR) and the emergency to operate at high clock frequency, as for maximum transfer rate 1.6GB/s. It is memory standard of the next generation who improves
At the beginning it was expected as the memory for the personal computer which is substituted to SDRAM with the extensive backup of the Intel corporation, but spread is late from the fact that among other things you could announce the trouble of chip set of the Intel corporation which corresponds to lag of the price price decline with the fact that production volume is small and dispute and Direct RDRAM which go round the intellectual property right of the Rambus |
