Screen Size and Model Guide

3270 screen size depends on the terminal model in use.

Model Sizes

Model	Rows	Columns	Typical use
2	24	80	Standard 3270 screens
3	32	80	Extra rows
4	43	80	Large-screen workflows
5	27	132	Wide-screen workflows

Why This Matters

Your model affects:

• How much of a screen is visible
• Cursor coordinates used in recordings
• Compatibility with host applications that expect a specific size

If a host app expects 24x80, use Model 2 unless instructed otherwise.

Choosing a Model

Set your model in configuration or .env.

Example:

S3270_MODEL=2

Alternative values are also accepted (for example 3279-4-E).

Practical Guidance

• When recordings fail at FillString coordinates, confirm the same model is active.
• Keep the same model across environments (dev/test/prod) for reliable playback.
• If text alignment looks wrong, check both model and code page settings.