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Sega Mega-CD5555555
The '''Sega Mega-CD''' ([[Japanese language|Japanese]]: &#12513;&#12460;CD) is an add-on device for the [[Sega Mega Drive]] released in [[Europe]], [[Australia]] and [[Japan]]. The [[North America|North American]] version is called the '''Sega CD'''.

The device will allow the user to both play CD audio discs and specially designed game CDs. It can also play [[CD plus G|CD+G]] discs.

(contracted; show full)Some European countries ([[Spain]] for instance), wouldn't get the original Mega-CD, but the Mega CD 2, which also slowed sales. 

===Australia===
The [[Australia|Australians]] got their Mega-CD on [[19 April]], [[1993]].

==Models==
The following models were released:
*Sega Mega-CD I (Sega CD I in North America)
.
*Sega Mega-CD II (Sega CD II in North America). Designed for the Mega Drive/Genesis II and to reduce manufacturing costs..
*JVC Wondermega ([[Xeye]] in North American release, never released in Europe), was a all-in one Genisis /Sega CD unit.
*Sega Multimega (called Sega CDX in North America). A portable CD player that plays both Mega Drive and Mega-CD games.
*Pioneer LaserActive Sega CD module, an add-on device you could add to a Laseractive Pioneer [[Laserdisc]] player.

==Technical Specifications==

===CPU===
Main CPU: [[Motorola 68000]] 16 bit processor running at 12.5 MHz

<i>(Same as the Mega Drive/Genesis. Acts as a coprocessor along with the Genesis CPU. One must note that the Genesis clock speed is slower (7.9 MHz)).</i>

===Graphics===
* Graphics Processor: Custom ASIC
* Number of simultaneous colours on screen:  64. (Using programming tricks, this limit is increased to 128 colours via HAM "Hold and Modify").
* Colours available in Cinepak and TruVideo modes: 128 to 256 colours
* Video size from 1/4 to full screen.
* Advanced compression scheme
* Software-based upgrade

===RAM===
* Main RAM: 6 Mbit 
* PCM samples: 512 Kbit 
* CD-ROM data cache: 128 Kbit 
* 64 Kbit Internal Backup RAM

The Mega CD also features sprite enhancement effects such as scaling and rotation, similar to that of the [[Super Famicom]]/[[SNES]] Mode 7.

===Storage===
* 500 MB CD-ROM discs (equivalent to 62 min of audio data)
* 1/4 screen B/W footage video: 1.5 to 4 hours
* 1/4 screen color footage: 45 minutes
* CD-ROM drive transfer rate: 150 kbytes/s (1X)
<i>(Above specs prior to compression)</i>

===Bios===
* Size: 1 Mb
* Used for Ggames, cdCD player, cd+gCD+G and karaoke.
* Access time: 800 ms

<table border="1" cellpadding="3" cellspacing="0">
<caption>'''Bios Revisions'''</caption>

<tr><td>Bios Version <td> Machine</td></tr>
<tr><td>1.00<td> Original Mega CD</td></tr>
<tr><td>2.00<td> Mega CD2 (Sega CD2 in North America)</td></tr>
<tr><td>2.05<td> Mega CD2</td></tr>
<tr><td>2.10<td> Mega CD2</td></tr>
<tr><td>2.21<td> Sega Mega LD (Japan), Sega Multimega (Europe), CDX (North America)</td></tr>
</table>


===Audio===
<i>The Mega cdCD adds 10 extra sound channels to the existing Mega Drive Z80 [[SPU]].</i>

* Sound format: Stereo PCM.
* Sound channels: 8
* Maximum sample rate:32 KHz (44.1khKHz for CD-DA).
* 16 Bit [[DAC]]
* 8X internal over-sampling digital filter
* Frequency Range: 20Hz - 20 KHz
* Signal-to-Noise Ratio: > 900dB @ 1K
* Channel Separation: >  900 dBvchgghc
* Output: RCA stereo Pin Jack x2 (L/R) / SCART cable

===Other===
Dimensions: 301mm x 212.5 x 112.5</br>
Weight: 1.4 kg (3.1 lbs)

==External Links==
*[http://www.consoledatabase.com/consoleinfo/segamegacd/index.html Console Database] - Sega Mega CD/Sega CD

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[[fr:Mega-CD]]
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[[Category:Video game consoles]]
[[Category:Sega]]