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• VDP
  [[File:Model1GenesisVDP.jpg|333px|thumb|right|The VDP in a Model 1 [[Mega Drive|Mega Drive.]]The [[VRAM]] is visible near the bottom left, and ...m VDP is in turn derived from the Texas Instruments TMS9918A. In all Model 1 Mega Drives, the VDP is a dedicated large chip on the main motherboard, as
  62 KB (9,790 words) - 10:31, 30 April 2015

• File:Model1GenesisVDP.jpg The VDP inside an early Model 1 North American Genesis. (1,924 × 1,620 (458 KB)) - 11:44, 16 March 2015

• File:Model1GenesisVRAM.jpg The VRAM on a Model 1 Sega Mega Drive. (2,051 × 2,051 (937 KB)) - 11:44, 16 March 2015

• File:Model1MegaDriveSoundCPU.jpg The [[Zilog Z80|Z80]] and Sound RAM in a Model 1 Sega Mega Drive. (3,208 × 2,324 (1,013 KB)) - 11:44, 16 March 2015

• Zilog Z80
  ...middle, sound circuitry on the right, YM2612 on the lower right on a Model 1 [[Mega Drive|Mega Drive.]]]]
  9 KB (1,549 words) - 11:29, 16 March 2015

• File:Model1MegaDriveYM2612.jpg The [[YM2612]] chip in a Model 1 Sega Mega Drive. The heat sink for the voltage regulators is visible, as we (2,503 × 2,503 (1.41 MB)) - 23:06, 14 August 2015

• YM2612
  [[File:Model1MegaDriveYM2612.jpg|350px|thumb|lright|The YM2612 in a Model 1 Mega Drive. The VDP is visible near the top right, as well as the [[Zilog Z ...In general, Part 1 contains global chip control and registers for channels 1-3, whereas part 2 contains registers for channels 4-6.
  12 KB (1,946 words) - 11:29, 16 March 2015
• Mega Drive
  Model 1 and Model 2 Mega Drives have an expansion port for the [[Sega CD]] peripher ===Model 1===
  9 KB (1,467 words) - 16:19, 16 March 2015
• File:Mega Drive Sound Sample.ogg
  ...le of the [[Mega Drive]]'s sound capability, recorded from Streets of Rage 1.
  83 bytes (14 words) - 11:29, 16 March 2015
• Howto:Initialise a Mega Drive
  ...ess in it for the text "SEGA" and then loads your game's code. Early Model 1 Mega Drives do not have a [[Trademark Security System|TMSS]] - but you stil RomEndLoc: dc.l EndOfRom-1 ; ROM end
  9 KB (1,562 words) - 10:40, 1 September 2017
• Template:Block
  '''{{{1}}}'''
  126 bytes (14 words) - 11:29, 16 March 2015
• Trademark Security System
  ...or TMSS, was a feature Sega added in later revisions of the [[Mega Drive]] 1 and all [[Mega Drive]] 2 and 3 models that is an attempt at locking out unl
  3 KB (569 words) - 11:29, 16 March 2015
• Template:Multicol
  {{{1}}}
  575 bytes (61 words) - 11:29, 16 March 2015
• TMS9918
  ...fference between '1' and the '2' in 'TMS9918A' and 'TMS9928A' is that the '1' version outputs composite NTSC video, while the '2' versions (including th * '''Mode 1 (Graphic 1):''' 32×24 characters. Each 8 characters in the character set has a foregr
  10 KB (1,652 words) - 11:29, 16 March 2015
• 32X
  As the 32X is an add-on, it can only be used in conjunction with a Model 1 or Model 2 Mega Drive. it is plugged in where the cartridge bay is and cann
  8 KB (1,376 words) - 11:29, 16 March 2015
• Echo
  ...from $00 (loudest) to $0F (quietest). Each byte represents one tick (i.e. 1/60th of a second), and looping is possible. The start of the loop is marked
  7 KB (1,170 words) - 11:29, 16 March 2015
• Echo Stream Format
  | Note on FM channel #1 | Note on PSG channel #1
  10 KB (1,542 words) - 11:29, 16 March 2015

• File:315-5309 pinout.png A pinout diagram of the IO chip found on early Model 1 [[Mega Drive]]s. It handles the version register, as well as IO ports. (1,936 × 1,472 (82 KB)) - 22:18, 2 July 2015

• 315-5309
  | $A10003 || $A10003 || [[315-5309#Data_Register|Data]] 1 | $A10009 || $A10009 || [[315-5309#Control_Register|Control]] 1
  6 KB (1,008 words) - 11:29, 16 March 2015

• File:315-5309-MD1VA3.jpg A picture of the [[315-5309]] IO controller on a VA3 Model 1. Part of the low RAM chip can be seen on the bottom, with some protection f (1,224 × 1,200 (476 KB)) - 22:18, 2 July 2015

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