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Over its lifetime, the Genesis came in three different models, each of which had several motherboard revisions. For more details, see [[Sega Genesis Hardware]].
===Sega Mega Drive/Genesis [Model 1]===
[[File:Genesis_system.jpg|thumb|200px|Model 1 Genesis]]
The model 1 Sega Genesis is the largest model and features a headphone jack with a volume slider. There are at least seven motherboard revisions of the model 1 that are known to exist, labeled VA1 - VA7. Early revisions, which bear the text "HIGH DEFINITION GRAPHICS" in white above the cartridge slot, are considered to have the best audio output of any version of the Genesis. The VA7 is the latest revision, and internally they are similar to the model 2 Genesis, and they do not have the "HIGH DEFINITION GRAPHICS" text on them.
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Japan:
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*Japanese-language settings
*Headphone jack
*AUX port marked A/V OUT
*9-pin EXT. port
*RF modulator
*Has a cartridge lock
*On the circular molding, in purple is the text "AV Intelligent Terminal High Grade Multipurpose Use". At the bottom of the circle is a purple square section with a red power indicator LED.
*"Mega Drive" is printed in white on the lower right of the console to the left of the Sega logo.
*The reset button and start button on the joypad are blue.
*Early models have a small registered trademark icon (®) just to the right of the Sega logo to the lower right of the system.
*Model number HAA-2510
*Word "Tymakz" Printed under the cooling fan.
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<div class="mw-collapsible mw-collapsed" style="width:100%">Europe, Australia and New Zealand:<div class="mw-collapsible-content"> *Video outputs PAL 50 Hz signal.*Smaller "16 BIT" logo than Japanese model, as per the Genesis.*English-language settings.*Unable to play Japanese Mega Drive games due to shape of cartridge slot. However, adapters were sold to play Japanese games in the European model, and by widening the cartridge slot it is possible to play many import games with no additional modifications, especially with the earlier games.*Cartridge lock removed.*The text "High Definition Graphics · Stereo Sound" located behind cartridge port (only found on earlier models).*The reset button and the start button are white.*Model number 1600-03 (original model), 1601-03 (second variation without "High Definition Graphics - Stereo Sound" text or EXT port)</div></div> ===Sega Mega Drive/Genesis [Model 2]===
[[File:Genesis-model2.jpg|thumb|200px|Model 2 Genesis]]
The model 2 was smaller than the model 1 and lacked a headphone jack but was capable of outputting stereo audio through its rear A/V multi-out port.
===Sega Mega Drive/Genesis [Model 3]===
[[File:Genesis-model3.jpg|thumb|200px|Model 3 Genesis]]
The model 3 suffered from compatibility issues.
==Variations==
===Sega Mega Drive===
===Sega Mega Drive 2===
Sega Mega Drive 3
