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{{DISPLAYTITLE:Apple II<span style="font-size:75%">GS</span> emulators}}
 
{{DISPLAYTITLE:Apple II<span style="font-size:75%">GS</span> emulators}}
 
{{Infobox console
 
{{Infobox console
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|title = Apple II<span style="font-size:75%">GS</span>
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|title=Apple II<span style="font-size:75%">GS</span>
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|image = AppleIIGSPC.png
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|image=AppleIIGSPC.png
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|imagecaption = An Apple II<span style="font-size:75%">GS</span> PC.
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|imagecaption=An Apple II<span style="font-size:75%">GS</span> PC.
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|developer = [[Apple Inc.|Apple Computer, Inc.]]
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|developer=Apple Computer, Inc.
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|type = [[:Category:Computers|Computers]]
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|type=[[:Category:Computers|Computers]]
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|release = September 1986
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|release=September 1986
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|introductory price = {{Inflation|USD|999|1986}}
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|discontinued=December 1992
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|discontinued = December 1992
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|predecessor = [[Apple II Line|Apple II]]
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|predecessor = [[Apple II line|Apple II]]
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|emulated={{✓}}
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|emulated = {{✓}}
 
 
}}
 
}}
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{{stub}}
  
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The '''[[Apple II line|Apple II]]<span style="font-size:75%">GS</span>''' is a 16-bit PC produced by Apple Computer, Inc. It was created to compete with the [[Amiga line|Amiga]] and the [[Atari ST line|Atari ST]] lines of PCs.
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The [[Apple II Line|Apple II]]<span style="font-size:75%">GS</span> is a 16-bit PC produced by Apple Computer Inc. It was created to compete with the [[Amiga Line|Amiga]] and the [[Atari ST Line|Atari ST]] lines of PCs.
  
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Despite the Apple II<span style="font-size:75%">GS</span> name, it is a completely different architecture. The system has a chip called the “Mega II” which is an [[Apple II line|Apple //e]] on a chip, making it fully backwards compatible with Apple ][ software.
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Despite the Apple II<span style="font-size:75%">GS</span> name, it is a completely different architecture. The system has a chip called the “Mega II” which is an [[Apple II Line|Apple //e]] on a chip, making it fully backwards compatible with Apple ][ software.
  
 
It was the first machine from Apple to use the Apple Desktop Bus and the first to provide a colour version of QuickDraw since the first colour Macintosh was not available until 1987. However it does not provide a high-resolution square pixel mode.
 
It was the first machine from Apple to use the Apple Desktop Bus and the first to provide a colour version of QuickDraw since the first colour Macintosh was not available until 1987. However it does not provide a high-resolution square pixel mode.
  
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==Emulators==
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==Processor==
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{| class="wikitable" style="text-align:center"
 
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! scope="col"|Name
 
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! scope="col"|Platform(s)
 
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! scope="col"|Latest version
 
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! scope="col"|<abbr title="Free/Libre and Open-Source Software">FLOSS</abbr>
 
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! scope="col"|Active
 
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! scope="col"|[[Recommended Emulators|Recommended]]
 
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|-
 
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! colspan="7"|PC / x86
 
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|-
 
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| [[KEGS]]
 
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| align=left|{{Icon|Windows|Linux|macOS}}
 
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| [http://kegs.sourceforge.net/ {{KEGSVer}}]
 
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| {{✓}}
 
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| {{✓}}
 
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| {{✓}}
 
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|-
 
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| [[GSplus]]
 
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| align=left|{{Icon|Windows|Linux|macOS}}
 
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| [https://github.com/digarok/gsplus/releases {{GSplusVer}}]
 
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| {{✓}}
 
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| {{✗}}
 
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| {{~}}
 
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|-
 
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| [https://david-schmidt.github.io/gsport GSport]
 
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| align=left|{{Icon|Windows|Linux|macOS}}
 
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| [https://github.com/david-schmidt/gsport/releases {{GSportVer}}]
 
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| {{✓}}
 
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| {{✗}}
 
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| {{✗}}
 
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|-
 
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| [https://www.sheppyware.net/software-mac/sweet16/ Sweet16]
 
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| align=left|{{Icon|macOS}}
 
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| [https://www.sheppyware.net/software-mac/sweet16/ {{Sweet16Ver}}]
 
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| {{?}}
 
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| {{✗}}
 
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| {{?}}
 
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|-
 
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| [[MAME]]
 
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| align=left|{{Icon|Windows|Linux|macOS|FreeBSD}}
 
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| [http://www.mamedev.org/release.html {{MAMEVer}}]
 
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| {{✓}}
 
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| {{✓}}
 
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| {{✗}}
 
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|-
 
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| [https://www.crossrunner.gs/ Crossrunner]
 
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| align=left|{{Icon|Windows}}
 
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| [https://www.crossrunner.gs/ {{CrossrunnerVer}}]
 
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| {{?}}
 
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| {{✓}}
 
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| {{?}}
 
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|-
 
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|}
 
  
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==Processor==
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The central processor is a 65816, a backwards-compatible 16-bit update to the 6502 that was also used in the Super Nintendo. It runs natively at 2.8Mhz but will slow down to ~1Mhz when in classic Apple II emulation mode.
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The central processor is a 65816, a backwards-compatible 16-bit update to the 6502 that was also used in the Super Nintendo. It runs natively at 2.8Mhz but will slow down to ~1Mhz when in classic Apple II emulation mode or when writing to video memory.
 
  
 
==Graphics Capabilities==
 
==Graphics Capabilities==
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In addition to RGB emulations of the existing Apple II artefact composite video modes, the IIgs adds 320x200 and 640x200 RGB colour modes; the former in various combinations of 16 colours per line and the latter at 4 colours per line (including a hardware dithering mode that acts a little like 16 colours per line). Each line may use any of 16 palettes, making a total of 256 colours on screen without raster-linked palette changes.
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In addition to RGB emulations of the existing Apple II artefact composite video modes, the IIgs adds 320x200 and 640x200 RGB colour modes; the former in various combinations of 16 colours per line and the latter at 4 colours per line (including a hardware dithering mode that acts a little like 16 colours per line). Hardware support is provided for changing palettes between lines.
  
 
There is also some support for 'fill mode', in which colour 0 means "repeat the last non-zero colour", designed to aid in fast single-colour fills.
 
There is also some support for 'fill mode', in which colour 0 means "repeat the last non-zero colour", designed to aid in fast single-colour fills.
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Colours are selected from a 12-bit RGB 4,096 colour palette; the IIGS therefore has the same total colour range as its contemporaries the Commodore Amiga, the Atari STE and the Acorn Archimedes.
 
Colours are selected from a 12-bit RGB 4,096 colour palette; the IIGS therefore has the same total colour range as its contemporaries the Commodore Amiga, the Atari STE and the Acorn Archimedes.
  
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However it is subject to a number of deficiencies: there is a single buffer for video only — double buffering is not supported — and it supports neither hardware scrolling nor hardware sprites; and as all writes into video memory clock the CPU down to 1Mhz these are expensive to perform in software.
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==Audio Capabilities==
  
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==Audio Capabilities==
 
 
The IIGS provides a 32-channel wavetable Ensoniq sound chip, which uses 64kb for samples.
 
The IIGS provides a 32-channel wavetable Ensoniq sound chip, which uses 64kb for samples.
  
 
The OS by default configures this as 15 stereo channels and uses the remaining two channels as interrupt counters; the IIGS is therefore often described as a 15-channel machine.
 
The OS by default configures this as 15 stereo channels and uses the remaining two channels as interrupt counters; the IIGS is therefore often described as a 15-channel machine.
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==Emulators==
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{|class="wikitable" style="text-align:center"
 +
!scope="col"|Name
 +
!scope="col"|Operating system(s)
 +
!scope="col"|Latest version
 +
!scope="col"|Active
 +
!scope="col"|[[Recommended Emulators|Recommended]]
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|-
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|[[KEGS]]
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|Multi-platform
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|0.91
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|{{✗}}
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|{{✓}}
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|-
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|[[GSplus]]
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|Multi-platform
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|0.14
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|{{✓}}
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|{{~}}
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|-
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|[[GSport]]
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|Multi-platform
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|0.31
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|{{✗}}
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|{{✗}}
 +
|-
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|[[MAME]]
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|Multi-platform
 +
|{{MAMEVer}}
 +
|{{✓}}
 +
|{{✗}}
 +
|}
  
  
 
{{Apple}}
 
{{Apple}}
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[[Category:Computers]]
 
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[[Category:Apple computers]]
 

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