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===Sega Mega Drive/Genesis model 1===
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.
===Sega Mega Drive<br /Genesis model 2===>
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.
Changing in the audio mixing circuts of the model 2 genesis gave it lesser sound quality than the early model 1 genesis.
===Sega Genesis model 3===[[File:Genesis-model3.jpg|thumb|200px|Model 3 Genesis]]The model 3 was released exclusively to North America in 1998 as a "budget system", and sold for $50. Many features were removed as cost cutting measures such as the expansion slot used by the sega cd, stereo sound, and a power LED.<br />
The genesis 3 had compatibility issues with virtua racing.<br/>
A addressing bug was fixed with the genesis 3, which makes it incompatable with games that exploit this bug.
Attempt to organize information for less clutter, without removing any information.
==Hardware==
Over its lifetime, the Genesis came in three different models, each of which had several motherboard revisions. For more details, see [[Sega Genesis Hardware]].
{| class="mw-collapsible mw-collapsed wikitable" style="width: 100%;" style="text-align: left;"
! colspan=2 width="100%"|Sega Mega Drive/Genesis Model 1 differences
|-
! Country !! Particularities
*"HIGH DEFINITION GRAPHICS" along circle above cartridge slot, and "SEGA GENESIS" graphic in two shades of gray, on early models.
*Model number MK-1601 is made in Japan, newer revisions were made in Taiwan to cut production costs
*Are considered to have the best audio output of any version of the Genesis.
|-
|style="text-align:center"|Asia ||
*Model number: 1601-15 (revision without the EXT port)
*Not region locked.
|- style="font-size:0; line-height:0;"
! style="width:10%; padding:0" |
|}
{| class="mw-collapsible mw-collapsed wikitable" style="width: 100%;" style="text-align: left;"
! colspan=2 width="100%"|Sega Mega Drive/Genesis Model 2 differences
|-
! Country !! Particularities
*New square shape
*No headphone jack
*One custom multi-output for picture and sound(stereo)
*Has a red power LED between the power and reset buttons
*"Genesis" logo printed in the area above the cartridge slot
|}
{| class="mw-collapsible mw-collapsed wikitable" style="width: 100%;" style="text-align: left;"! colspan=1 width="100%"|Sega Genesis Model 3 differences|-! Particularities|-|[[File:Genesis-model3.jpg|200px|right]]*The sega 32xmodel 3 was released exclusively to North America in 1998 as a "budget system", and sold for $50 with many features removed for cutting costs. *Smaller square shape *No expansion port*No headphone jack*No power LED, but there is a red mark underneath the power base converter switch, which becomes visible when the Genesis 3 is turned on*One multi-output for picture and could not sound. It has the necessary pin outs to be used with the sega cd due able to use the lack Genesis 2 Stereo A/V cable; though an apparent revision of the Genesis 3 was manufactured that is incompatible with stereo sound, despite also having the pin-outs*Does not support [[Sega CD]], [[Sega 32X]] or [[Power Base Converter]]*"Sega Genesis 3" written below cartridge slot*Model number MK-1461*Does not support [[Game Genie]] device*In addition, Japanese Mega Drive cartridges (which do not contain an expansion internal region lockout) can be played without a converter or modification, as the cartridge slot, which is the same shape as the original Japanese console, allows for these cartridges to be inserted freely.*Has compatibility issues with virtua racing.*An addressing bug was fixed with the genesis 3, which makes it incompatible with games that exploit this bug.|}
===Sega CDX/Multi-Mega===
===[[File:800px-Genesis-CDX-Console-Set.jpg|thumb|200px|Sega CDX]]===
About 5,000 CDX units were released in North America, and are considered rare and collectable.
==Add-ons==
*[[Sega 32X]]
