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Amiga Screens: A Primer explains screen concepts
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Illustration only Photo by Ivan Bandura on Unsplash
The article describes Amiga screen types, resolutions, colour depths and bitplane graphics.
Understanding Amiga screen architecture clarifies how the platform handled multitasking and graphics performance, influencing retro development practices.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
Amiga screens are OS-defined display areas that can vary in resolution and colour depth.
Colour is managed through indexed palettes and planar bitplanes, with up to five bitplanes on OCS.
Multiple screens can coexist, enabling multitasking and varied graphics modes.
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The article explains that an Amiga screen is an OS-defined display area, distinct from generic terms like "playfield" used in hardware manuals.
It details how planar graphics work, noting that each bitplane stores part of a pixel's colour index and that up to five bitplanes yield 32 colours on original Amiga hardware.
The piece highlights that Amiga screens can have different resolutions and colour depths, such as low-res (320×256, up to 32 colours) and high-res (640×256, up to 16 colours), with optional overscan extensions.
It notes the use of HAM and EHB modes for expanding colour ranges beyond the standard bitplane limits, illustrating how the hardware overcame memory constraints.
Finally, the article connects screen capabilities to Amiga's preemptive multitasking, showing that the graphics architecture supported multiple concurrent screens for diverse applications.
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