Demo User’s Guide

You should also see the following simulated host message in the console window:

DOWNLOAD COMPLETE ON RJELU1.

∙At this point, feel free to try some of the other menus such as Transmit File, Transmit Application Request, Transmit Logoff, and Transmit Logon. Each time that the first LU logs on, the simulated download message will appear in the console window and then that LU will receive the simulated download from the host.

∙When you are finished, select the Session Disconnect menu to disconnect from the demo host and then choose Session Quit to exit the program.

Running 3770Link SO and Simulating an Unattended Session

Due to the fact that unattended sessions are setup and behave differently depending on whether you will be using a single LU or multiple LUs, a demonstration of an unattended session using 3770Link SO is not included. However, we have included an icon which shows how 3770Link SO can be run in interactive mode to enter script commands from a command line type of interface. To run 3770Link SO in this manner, double click on the “3770Link Script Processor Demo” icon and try entering commands such as CONN, RCV, DISC, and QUIT.

If you are interested in learning about how you can use 3770Link for unattended sessions, consult the 3770Link help file and search for “master connect script” and “sample script files”.

9

Page 10 Page 12
Page 11
Image 11
IBM manual Running 3770Link SO and Simulating an Unattended Session
Page 10 Page 12

3770 specifications

The IBM 3770, introduced in the mid-1970s, was a pioneering multi-user data station known for its innovative design and functionality, aimed primarily at supporting online transaction processing. As one of the early efforts in integrating computers with communication technology, the 3770 set a foundation for subsequent advancements in the field.

One of the standout features of the IBM 3770 was its ability to support multiple user connections simultaneously. This multi-user capability allowed organizations to connect various terminals to a central computer, facilitating efficient data entry and retrieval processes. Each terminal could communicate with the mainframe, enabling users to access real-time data and execute transactions concurrently, which was revolutionary for its time.

The 3770 utilized a proprietary communication protocol that leveraged synchronous serial communication, ensuring reliable data transmission over telephone lines and enabling the automation of remote data entry. This technology reduced the need for physical interaction with centralized data processing systems, leading to increased productivity and efficiency in organizational workflows.

In terms of characteristics, the IBM 3770 was equipped with a dedicated processor for handling input and output operations. This feature offloaded routine tasks from the mainframe, optimizing overall performance and freeing up computational resources for more intensive processing activities. Additionally, the system was designed to support a variety of input devices, including keyboards and card readers, accommodating different user preferences and operational needs.

The architecture of the IBM 3770 included a unique data format that streamlined the handling of transactions. This format allowed for easy integration with existing databases and applications, making it an attractive solution for businesses looking to modernize their data processing capabilities. The system also featured built-in error detection and correction routines, which ensured data integrity during transmission.

Moreover, the IBM 3770 was recognized for its flexibility and scalability. Organizations could easily expand their networks by adding more terminals or connecting additional mainframe storage. This scalability was crucial for businesses experiencing growth, as it eliminated the need for frequent system overhauls.

In summary, the IBM 3770 was more than just a data station; it was a significant step forward in online transaction processing, combining innovative communication technologies with multi-user functionality. Its features, such as dedicated processing, support for various input devices, and scalability, set the stage for future advancements in data systems and remain influential in shaping the landscape of computing.
Top Page Image Contents