Application Configurations 2-7

VisuaLink Director Software

This Microsoft Windows 95®software allows the PC to control the VisuaLink 128/384 unit, thereby providing complete control of the videoconference. All functions are provided with easy to use PC screen messages and menus.

Options

Additional options are available with the Desktop PC application configuration:

NT1

Graphics Camera

D30 Camera

AT841/INT Microphone

If using the Desktop PC with external ISDN BRI connections, one (VisuaLink 128) or three (VisuaLink 384) BRI NT1 interface units will be required.

Additional cameras for motion and a graphics camera can be added to the Desktop PC configuration. Still graphics for hardcopy presentations, drawings, or brochures could be presented in a videoconference using a document camera.

If needed, additional microphones may be used. Up to three microphones can be used with VisuaLink. Typical desktop configurations would require only one microphone for the desktop user.

VisuaLink 128/384 General Description

Page 19
Image 19
NEC 128 manual VisuaLink Director Software, NT1 Graphics Camera D30 Camera AT841/INT Microphone

128 specifications

The NEC 128 is a remarkable microprocessor that represents a significant leap in technological innovation during its time. Introduced in the early 1980s, this processor was designed to meet the demands of increasingly sophisticated computing tasks, primarily aimed at the burgeoning field of personal computing and embedded systems.

One of the standout features of the NEC 128 is its 16-bit architecture, which was quite advanced for its era. This architecture allows for a greater data throughput, enabling the handling of larger data sets and providing improved performance over its predecessors. The NEC 128 operates on a clock speed that typically ranges from 4 to 8 MHz, making it capable of executing instructions efficiently and swiftly, which was crucial for running more complex applications.

The processor is built using CMOS technology, which offers significant advantages in terms of power consumption compared to earlier bipolar technology. This characteristic made the NEC 128 not only suitable for desktop computing but also an appealing choice for battery-operated devices, enhancing its versatility. The use of CMOS allowed for a reduced heat output, contributing to the reliability and longevity of devices powered by this microprocessor.

Another noteworthy aspect of the NEC 128 is its support for a variety of addressing modes. This flexibility enables programmers to write more efficient and compact code, optimizing the use of memory resources. By supporting both immediate and indirect addressing, the NEC 128 allows for more dynamic programming, which is essential for developing applications that require real-time processing.

The processor's architecture also includes a robust instruction set that facilitates arithmetic operations, logical operations, and control flow management. This comprehensive instruction set is instrumental for developers, as it provides the necessary tools for creating a wide range of applications, from simple utilities to more complex software systems.

In summary, the NEC 128 microprocessor is characterized by its 16-bit architecture, efficient CMOS technology, and a versatile instruction set, making it a compelling choice for its era. Its combination of performance, power efficiency, and flexibility positioned it as a formidable player in the personal computing market and laid the groundwork for future advancements in microprocessor technology. With its various applications and features, the NEC 128 remains a noteworthy chapter in the history of computing.