Using the Hydra Protocol Converter for IBM Full Screen Terminal Emulation at ANL.

摘要

The Hydra Protocol Converter is a dedicated microprocessor that allows selected ASCII terminals, and personal computers emulating ASCII terminals, to achieve full screen capabilities similar to IBM 3277 terminals. Through the Argonne Private Branch Exchange (PBX) at extension 2-3270, you can use the Hydra for full screen terminal access to all the central IBM computer interactive services (CMS, MVS Wylbur, CICS, and MVS TSO). These services are more flexible and easier to use if you have full screen terminal capabilities; the Hydra provides excellent emulation of most IBM 3277 terminal features, and it displays the effects of your keystrokes immediately on your terminal screen. In addition, the Hydra permits you to transfer files between CMS and personal computers running either the Kermit or RELAY Gold programs. The Hydra communicates asynchronously at communication speeds ranging from 300 baud to 19.2 kilobaud (a baud is one bit, or binary digit, per second). Generally, use the fastest speed (baud rate) that your ADI (Asynchronous Data Interface) or modern and terminal or terminal emulation program can sustain; the Hydra will automatically adjust to the speed you have set. However, at high speeds, the Hydra may overrun your terminal, causing missing, misplaced (garbage) characters on your display. If such characters occur, specify automatic XON/XOFF flow control or try changing to a lower communication rate (see ''Setting Your Communication Rate'' in the section of Appendix B relevant to your terminal equipment, or the chapter on your terminal.) There are several methods of emulating full screen IBM terminals besides using the Hydra (such as software packages). However, the Hydra is the most efficient method at Argonne. Throughout this document, all mention of full screen emulation refers to emulating IBM 3277-type terminals with the Hydra. 1 fig., 7 tabs. (ERA citation 14:014085)