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58 lines
1.9 KiB
Markdown
58 lines
1.9 KiB
Markdown
The **FunKey S** retro-gaming console software contains a set of
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console emulators, standalone games, applications and utilities using
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a custom Operating System (OS) that from now on will be referenced as
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**_FunKey-OS_**.
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The **FunKey-OS** is a Linux-based operating system, optimized for the
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**FunKey-S** hardware, with a special focus on performance and fast
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boot time.
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## Instant Action
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The **FunKey S** introduces a unique feature called **_Instant
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Action_**, which enables automatically saving the running state when
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closing the console before turning it off, and restoring this state
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when opening and turning it back on in a matter of seconds.
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This feature is only possible because of the optimized fast boot time
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detailed in the [Boot Process][1] section.
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## Storage
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The only storage system available in the **FunKey S** is its
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integrated MicroSD card. Most of its contents is made available to a
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host computer when connected over USB.
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The MicroSD card format is detailed in the [Disk Partition][2]
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section.
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## Video Processing
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The **FunKey-S** CPU does not feature a GPU. For this reason, the
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**FunKey-S** cannot use a hardware-accelerated OpenGL engine, and
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adding a software-emulated OpenGL-ES engine is not efficient, given
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the limited CPU performance.
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However, because of the small screen size and the fact that all
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applications are used in full-screen mode only, there is no need for a
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full-blown windowing system like X11, which greatly simplifies the
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video processing as no window overlapping or frame decoration is thus
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required.
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Instead, all graphical computations are performed by the CPU itself,
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directly into the video frame buffer that will be sent to the screen
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for display.
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## User Input
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The **FunKey S** has no standard keyboard but features common
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console-oriented controls in the form of a D-Pad, A/B/X/Y Pad,
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Menu/On/Off, Fn and Start buttons.
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[1]: boot_process/index.md
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[2]: disk_mapping/partition_map.md
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--8<--
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includes/glossary.md
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--8<--
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