# Amiga Halfbrite mode

> planar display mode of the Commodore Amiga computer

**Wikidata**: [Q1385116](https://www.wikidata.org/wiki/Q1385116)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Amiga_Halfbrite_mode)  
**Source**: https://4ort.xyz/entity/amiga-halfbrite-mode

## Summary
Amiga Halfbrite mode is a vendor-specific planar display mode developed for the Commodore Amiga computer platform. It is classified as a computer display standard that, alongside Hold-And-Modify (HAM), enabled the display of up to 4,096 simultaneous colors on 1985 hardware through clever bit-plane manipulation, significantly exceeding the capabilities of contemporaneous PC standards.

## Key Facts
- **Classification**: Defined as an instance of a computer display standard.
- **Platform**: Exclusive to the Commodore Amiga computer.
- **Type**: A planar display mode.
- **Color Capability**: Achieved up to 4,096 simultaneous colors (in conjunction with HAM modes) on 1985 hardware.
- **Technical Method**: Utilizes clever bit-plane manipulation to extend color depth.
- **Standard Category**: Listed as a regional or vendor-specific standard, distinguishing it from neutral industry-wide specifications like VGA or EGA.
- **Wikipedia Title**: "Amiga Halfbrite mode".
- **Wikidata Description**: Described as a "planar display mode of the Commodore Amiga computer."
- **Freebase ID**: /m/01tb_z.
- **Commons Category**: Amiga EHB.
- **Language Availability**: Wikipedia articles or Wikimedia resources exist in 7 languages/contexts: commons, de, en, fr, hu, it, pl.

## FAQs
### What is Amiga Halfbrite mode?
Amiga Halfbrite mode is a planar display mode specifically designed for the Commodore Amiga computer. It functions as a vendor-specific computer display standard that enhances color output through bit-plane manipulation.

### How many colors could Amiga Halfbrite mode display?
When utilized alongside other Amiga-specific modes like Hold-And-Modify, this technology allowed for up to 4,096 simultaneous colors on hardware released in 1985. This capability was well beyond what was standard in the PC market at the time.

### Is Amiga Halfbrite mode a general industry standard?
No, it is classified as a vendor-specific or regional variant, similar to the Tandy Graphics Adapter or Texas Instruments Graphics Architecture. Unlike VGA or EGA, it was not intended for broad multi-vendor interoperability but for the specific Commodore Amiga platform.

## Why It Matters
Amiga Halfbrite mode matters because it represented a significant leap in display capabilities for home computers in the mid-1980s. By achieving up to 4,096 colors on 1985 hardware, it outperformed the established PC standards of the era, such as Color Graphics Adapter (CGA), Enhanced Graphics Adapter (EGA), and even early Video Graphics Array (VGA) specifications. This technological advantage allowed the Commodore Amiga to produce richer, more detailed graphics than its competitors, facilitating advanced gaming, desktop publishing, and GUI experiences. The mode is a key example of how vendor-specific optimizations could push hardware boundaries beyond the general industry norms of the time.

## Notable For
- Achieving up to 4,096 simultaneous colors on 1985 hardware.
- Utilizing clever bit-plane manipulation to maximize color depth.
- Being categorized as a vendor-specific standard distinct from IBM-compatible standards.
- Operating as a planar display mode on the Commodore Amiga.
- Having documentation and media available across seven Wikimedia languages and categories (commons, de, en, fr, hu, it, pl).
- Possessing a specific Freebase ID (/m/01tb_z) within structured knowledge graphs.

## Body
### Definition and Classification
Amiga Halfbrite mode is a technical specification classified as an instance of a computer display standard. Unlike neutral standards developed for broad industry adoption, it is categorized as a vendor-specific or regional variant. The mode is defined as a planar display mode, meaning it manages color data through distinct bit-planes rather than a packed pixel structure. Its primary platform is the Commodore Amiga computer, serving as one of the specialized graphics modes available on that system.

### Technical Capabilities and Performance
The distinguishing technical characteristic of Amiga Halfbrite mode is its ability to facilitate high-color graphics through "clever bit-plane manipulation." According to the source material, Commodore Amiga’s Hold-And-Modify and Halfbrite planar modes achieved up to 4,096 simultaneous colors. This performance level was realized on hardware dating back to 1985, placing it well above the contemporaneous PC standards of the era. For context, the dominant standards at the time included CGA (4 colors), EGA (16 colors from a 64-color set), and VGA (256 colors). The Amiga's capability to display 4,096 colors represented a substantial increase in color depth and image fidelity.

### Context Within Display Standards
In the broader taxonomy of display standards, Amiga Halfbrite mode is grouped with other vendor-specific solutions such as the Tandy Graphics Adapter (Tandy 1000), Texas Instruments Graphics Architecture (TI-99/4A), and the Japanese JEGA standard. These standards contrast with generalized, widely adopted specifications like VGA or XGA. While general standards aimed for interoperability across different hardware manufacturers, vendor-specific modes like Halfbrite were engineered to extract maximum performance from particular proprietary hardware architectures.

### Documentation and Metadata
The entity is documented under the title "Amiga Halfbrite mode" on Wikipedia and is associated with the Commons category "Amiga EHB." The concept has a recognized identity in structured data repositories, holding the Freebase ID `/m/01tb_z`. Its documentation and related media are available in multiple languages, including English (en), German (de), French (fr), Hungarian (hu), Italian (it), Polish (pl), and Commons, reflecting a broad international interest in this specific display technology.

## References

1. Freebase Data Dumps. 2013