Vmebus boards have data bus sizes of 16 , 32 , or 64 bits and are designed to be plugged into a backplane that has up to 21 slots for other boards . these other boards can ben cpu boards or peripheral boards providing various functions . the vmebus standard originated with the motorola versabus in 1979 which was designed using the then new mc68000 microprocessor 性能的提高主要是由于三个方面的改进： 1 .处理器及高速缓存性能的优化2 .降低内存瓶颈：通过对powerplus体系结构的改进，使内存性能提高到582mb s memory read bandwidth和640mb s burst write bandwidth 3 .系统总线吞吐率的优化：其他的芯片组对pci到内存带宽只能到70mb s ， powerplus ii则能达到80mb s而无须消耗额外的cpu资源。
Because eeprom is a standard component , its only function is saving data and does not include protection , so this simple circuit design protection lock , can be decoded by those with selfish purposes easily . after this protection lock was promoted for about a year , there was another protection lock that was developed by using asic as its major component . the circuit design of this protection lock was completed with the protection by chipset and added eeprom into it , which improved the defect of former eeprom protection locks with low protection 在保护锁的演进过程中，最早出现的保护锁是以eeprom为主要组件设计而成的，这种简单线路设计的保护锁，很容易被有心人破解，原因是eeprom为标准的零组件，而且eeprom只是用来储存数据，并不具有保护的效能，所以，在这种保护锁上市大约一年后，就有利用asic为组件所制作的保护锁上市，这种保护锁改进了以往采用eeprom保护锁之保护严谨度不够的缺点，这种线路设计的方式是将保护方法以芯片组完成，并将eeprom加入保护锁中，以达到软件保护的目的。
The author first analyzed spread spectrum technology that is used extensively in short - range wireless communications , and discussed some pseudo noise codes " application in spread spectrum technology . then it gave wireless transceiver ' s detailed block diagram in the physical layer . the author also introduced main chip ' s operating theory which is used in this system 本系统在无线收发部分采用dsss技术，工作在2 . 4ghzism频段，本文首先介绍了在短距离无线通信中广泛应用的扩频技术，讨论了几种伪随机码在扩频通信中的应用，然后给出了本系统中物理层所用的硬件电路的框图，介绍了所用芯片组的原理。
When you are running windows 98 second edition on a computer with a via technologies integrated device electronics controller that uses the apollo pro chip set , device manager may show the ide controller as disabled or as conflicting with another device if you disable the secondary ide 当您在具有via technologies的集成电路设备( ide ) controller并使用apollo pro芯片组的计算机上运行windows 98第二版时，如果您在计算机的基本输入输出系统( bios )禁用辅助ide信道， “设备管理器”可能显示ide controller不可用或者与其他设备冲突。
When you are running windows 98 second edition on a computer with a via technologies integrated device electronics controller that uses the apollo pro chip set , device manager may show the ide controller as disabled or as conflicting with another device if you disable the secondary ide channel in the computer s basic input output system bios 当您在具有via technologies的集成电路设备ide controller并使用apollo pro芯片组的计算机上运行windows 98第二版时，如果您在计算机的基本输入输出系统bios禁用辅助ide信道， “设备管理器”可能显示ide controller不可用或者与其他设备冲突。
