Model 204

Model 204 is a legacy database system developed by Computer Corporation of America, one of the oldest database systems still in limited use.

Why Agent Required

Model 204 runs on mainframe systems that cannot directly upload data to the web. The DataMeans Agent connects securely to your environment for extraction.

What You Can Extract

• Model 204 versions 2.x through 4.x
• Model 204 database files (internal Tables A through D)
• Table and record structures
• B-tree indexes

What You Get Out

DataMeans extracts your data into multiple modern formats:

Output	Description
csv/{TableName}.csv	One CSV file per table with all row data
xlsx/{TableName}.xlsx	Excel workbook per table
xls/{TableName}.xls	Legacy Excel format per table
json/{TableName}.json	JSON array of records per table
json/{TableName}.jsonl	Newline-delimited JSON (streaming-friendly)
postgres.sql	PostgreSQL CREATE TABLE + INSERT statements
schema/schema-graph.json	Relationship graph for visualization
schema/er-model.json	ER model for diagram tools
report.json	Structured extraction report
report.md	Human-readable extraction summary

How It Works

Agent availability: The DataMeans Agent is currently in development and not yet available for download. The steps below describe the planned workflow. To get notified when Model 204 support launches, reach out via our About page.

1. Download and install the DataMeans Agent on a system with Model 204 access
2. Configure connection to your database environment
3. Select schemas and tables to extract
4. The Agent extracts data and uploads securely to DataMeans
5. Review and download your converted data

Planned Support

• Record structure extraction
• Index analysis
• Variable-length record handling
• B-tree recovery

Known Limitations

• Requires DataMeans Agent installation
• Very specialized format may require consultation
• Limited documentation available

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Last updated: January 2026

Overview

Documentation coming soon.

This article will contain vendor-neutral technical documentation about the Model 204 database format, including:

• History and background
• File format specifications
• Data types and structures
• Version differences
• Technical references

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To learn how to use this format with DataMeans, see the User Guide.