Demo User’s Guide

RCVFILE.TXT

Text file for simulating received files

DLLSHARE.DLL

Windows dynamic link library

3770LINK.HLP

Help file

After you use 3770Link, you may also see the following files in your 3770Link directory:

JOBNAME.*

printer files created during demo

RECEIVE1.LOG

Log of files received

MRU.INI

Configuration file for this demo

Running 3770Link GUI and Simulating an Interactive Session

To execute the interactive version of 3770Link and see a simulated host session in action, perform the following steps:

Double click on the “3770Link Demo” icon to start the 3770link.exe program.

After an initial splash screen displaying information about 3770Link, you should see a Logical Unit (LU) window for each configured LU. The LU windows are used to display information from 3770Link concerning commands which you have issued. Initially, the demo program comes configured with 3 LUs; namely, RJELU1, RJELU2, and RJELU3. In addition to the LU windows, you should also see one console window, which is used to display messages from the host computer.

To connect to the host, use the mouse or keyboard to select the Session menu.

Select the Connect... menu.

Click on the OK button to begin the connection process on each LU. As the connection progresses, each LU window will display

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IBM manual Running 3770Link GUI and Simulating an Interactive Session, 3770LINK.HLP

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.