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==Model 3==
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Sega Mega Drive Motherboard revisions
==Model 1==
===M5 PAL Model 1 M5===
[[File:Genesis_pal_model1_M5.jpg|thumb|150px|PAL model 1 M5]]
===Model 1 VA1===
[[File:IC_BD_M5_VA1.jpg|thumb|150px]]Board label: IC BD M5 VA1
===VA2 NTSC Model 1 VA2===
[[File:IC_BD_M5_USA_VA2.jpg|thumb|150px|NTSC Model 1 VA2]]
Board label: IC BD M5 USA VA2
===VA3======VA4 PAL Model 1 VA4===
Board label: IC BD M5 PAL VA4
===VA5======VA6======VA6.8======VA7 NTSC Model 1 VA7===
[[File:PC_BD_M5_USA_VA7.jpg|thumb|150px|NTSC Model 1 VA7]]
==Model 2==
===VA0 PAL===
===VA1 NTSC Model 2 VA1===
[[File:Model2_va1_motherboard.jpg|thumb|150px|NTSC Model 2 VA1]]
| IC12 || ? || ? || Voltage regulator || <center>-</center>
|}
===VA1 ASIA===
===PAL Model 2 VA1.8NTSC=== ===VA1.8 PAL===
[[File:Genesis_pal_model2_VA1.8.jpg|thumb|150px|PAL model 2 VA1.8]]
|}
===VA1.8 ASIA===
===VA2===
===VA2.3===
===VA3===
===VA4===
==Model 3==
===VA1===
===VA2===
