Green Screen

Enhanced Definition

Colloquial term for traditional mainframe terminal interfaces, named after the green monochrome displays of early 3270 terminals. Refers to character-based block -mode terminal emulation.

Key Characteristics

- Character-based display (24 lines x 80 columns typically)
- Block-mode data entry
- Function key operation (PF1-PF24)
- Field-level attribute control
- 3270 data stream protocol
Terminal Types:
- 3270: Original terminal models
- 3278/3279: Enhanced models
- 3290: Large screen (up to 62x160)
- Emulators: PC-based terminal emulation
Screen Features:
- Protected and unprotected fields
- Field attributes (color, highlighting, intensity)
- Cursor positioning
- Function key definitions
- Attention identifiers (AIDs)
Modern Alternatives:
- GUI-based interfaces
- Web-based terminal emulators
- Mobile device access
- API-based integration
- Screen scraping and modernization

Use Cases

- Traditional mainframe application access
- System administration interfaces
- CICS transaction processing
- TSO command execution
- Legacy application interaction

Related Concepts

Related to: 3270, TSO, CICS, Terminal Emulation

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