Learn BANKING-COBOL-VARIANTS with Real Code Examples

Runs on mainframe systems (IBM z/OS, Unisys, Fujitsu)

Batch architecture driven by JCL and VSAM files

Real-time architecture via CICS/IMS

Integration often via MQ, file drops, or message queues

Modernization layers use APIs or Micro Focus runtimes

Batch execution via JCL

Online execution via CICS/IMS

Data handled via VSAM/DB2

Transaction messages via MQ/ISO8583

Output via reports, datasets, or downstream queues

Batch-oriented architecture

CICS-driven real-time flows

Modular COPYBOOK data definitions

Shared utilities for sorting and merging

API-wrapped modernization layers

Core banking mainframe

Credit card payments engine

ATM/POS ISO8583 switch

Loan management system

Interbank settlement platform

Reliability over novelty

Precision in financial arithmetic

Long-term backward compatibility

Modular COPYBOOK-driven design

Separation of batch and online workloads

Use parallel batch jobs

Leverage mainframe specialty processors

Distribute workloads across CICS regions

Optimize DB2 and VSAM I/O

Automate batch scheduling

Analyze dependencies (VSAM, DB2, CICS)

Refactor monolithic modules

Containerize via Micro Focus or z/OS runtime

Expose services via API gateways

Ensure financial accuracy post-migration