Command CICS
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Developer(s) | Ken Dakin APT Ltd, UK |
---|---|
Initial release | 1993 |
Stable release | n/a
/ 1 January 1993 |
IBM ES/9000 family, z/OS & compatibles | |
Type | Emulator |
License | Proprietary software |
Website | n/a |
Command CICS or Command-CICS is a software product that allows organizations to migrate from "Macro level"
History
When CICS was first released by
Macro level emulation
Command-CICS intercepted macro level applications via a Link-edited (static) "stub" positioned ahead of the Load module (
Macro interface
The application program proceeded to execute normal machine code instructions right up to its first macro level API call, thus adding zero overhead to the program until that point. As soon as the API call left the application program, Command-CICS code would gain control and replace the original linkage with its own, equivalent, Command-level call. In original earlier command level CICS versions (that supported both Macro and Command level programs), the CICS "Exec Interface Program" (DFHEIP) converted the Command level call to an 'actual macro level call. This would add a very small additional overhead only during CICS calls. Later versions of CICS, however, executed the CICS API directly, imposing no additional "backward compatibility" overhead.
Marketing
Command-CICS was initially sold by APT Ltd in the U.K. and APT International in mainland Europe and the rest of the world. At the present time CommandCICS is being offered by Advanced Software Products Group, Inc. of Naples, Florida, United States
Competition
CICS/COMET for z/OS - a similar product from UNICOM Systems Inc.[2] Adds some overhead (because of the requirement to dynamically add a stub).
References
- ^ "IBM - Command/CICS". ibm.com.
- ^ "UNICOM Systems, Inc. -- A Division of UNICOM Global :: CICS/COMET for z/OS". unicomsi.com.
External links
- [1] IBM webpage Command/CICS with link to UNICOM webpage
- [2] Archived 2015-03-30 at the Wayback Machine ASPG webpage
- IBM CICS official website CICS official website