Quantos Bits tem o Sega CD?

by Marcos Paulo Vilela
Quantos Bits tem o Sega CD?

A CPU principal do Sega CD é o processador de 16 bits Motorola 68000, de 12,5 MHz, 5 MHz mais rápido que o Mega Drive.

Especificações técnicas completas

As especificações do Sega CD eram as seguintes: 


A CPU principal é um processador Motorola 68000 de 12,5 MHz e 16 bits. O Mega Drive/Genesis possui o mesmo processador, mas com clock inferior de 7,67 MHz (NTSC) / 7,61 MHz (PAL).


  • Processador gráfico: ASIC personalizado
  • Número de cores simultâneas na tela: 64 de 512
  • Resolução da tela: 320 x 224 pixels e 256 x 224, tamanho de vídeo de ¼ a tela inteira
  • Esquema de compactação avançado
  • Atualização baseada em software
  • Efeitos de escala e rotação


  • RAM principal: 6 Mbits
  • Amostras PCM: 512 kbit
  • Cache de dados do CD-ROM: 128 kbit
  • RAM de backup interna de 64 kbits

Quantos Bits tem o Sega CD?


  • Discos CD-ROM de 500 MB (equivalentes a 62 minutos de dados de áudio)
  • Vídeo de filmagem em preto e branco de ¼ tela: 1,5 a 4 horas
  • ¼ de filmagem colorida da tela: 45 minutos
  • Taxa de transferência da unidade de CD-ROM: 150 kB/s (1x)

(Acima das especificações antes da compressão)


  • Tamanho: 1 MBit
  • Usado para jogos, CD player, CD+G e karaokê
  • Tempo de acesso: 800 ms
Revisões do BIOS
Versão do BIOSMáquina
1,00Sega Mega-CD original (Europa/Japão)
1.02Pioneer LaserActive Mega LD (Japão/América do Norte) (baseado na versão 0.98 proto Sega Mega-CD BIOS)
1.10CD original da Sega (América do Norte)
2h00Mega-CD 2 (Europa/Japão), Sega CD 2 (América do Norte)
2.11Mega-CD 2 (Europa/Japão), Sega CD 2 (América do Norte)
2.21Sega Multi-Mega (Europa/Japão), Sega Genesis CDX (América do Norte)


O Mega-CD adiciona 10 canais de som extras ao YM2612 e SN76489 do Genesis usando o chip Ricoh RF5C164

  • Formato de som: PCM estéreo
  • Frequência de clock da fonte: Até 12 MHz
  • Canais de som: 8
  • Taxa de amostragem máxima: 32 kHz (44,1 kHz para CD-DA)
  • Largura de dados de onda: 8 bits
  • DAC de 16 bits
  • Filtro digital de sobreamostragem interno 8x
  • Faixa de frequência: 20 Hz – 20 kHz
  • Relação sinal-ruído: > 90,0 dB @ 1K
  • Separação de canais: > 90,0 dB
  • Saída: RCA estéreo Pin Jack x2 (L/R) / cabo SCART
  • Porta de entrada de mixagem para som no modelo Mega Drive / Genesis original através dos conectores RCA na parte traseira da unidade Sega CD.


  • Dimensões: 301 mm × 212,5 mm × 112,5 mm
  • Peso: 1,4 kg (3,1 lb)


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Wayne Cuff 2021-08-30 - 4:48 am

Android assault is enough to warrant ownership.

Ken Spamfree 2021-08-30 - 5:14 am

Not worth the prices. Mega CD games are easily backed up and easy to emulate.

geminielectro 2021-08-30 - 8:30 am

12:26 I love this music. I have it in my Ipod…. My Mega-CD have reading issues, so I play my games on a RPI3. I also have Sonic CD and Final Fight but in japanese. The japanese Final Fight is unsensored!!! The best version for sure.

cossieboy2007 2021-08-30 - 7:00 pm

I bought my megadrive 2/mega cd 2 combo with 2 controllers, 2 mega cd games and all the cables for £15 on ebay 12 years ago, I still play sonic cd, but the games so expensive now

Chad deez 2021-08-31 - 7:42 am

Final Fight on Sega CD was kind of a big deal back then especially with Guy. That's all I'm saying.

David Martin 2021-08-31 - 3:10 pm

I've got the final fight music in my car. Ps emulations or not its always best played on the real deal.

KaraokeDuov2 2021-08-31 - 3:36 pm

Fun-fact: Mega-CD/Sega-CD also plays and displays karaoke CDs so you also have yourself a karaoke machine.

Xhizor NL 2021-08-31 - 6:11 pm

Ik heb alles nog vanaf 1989 van sega! Van de master system tot de dreamcast en alles er tussen in 😛

mrburglers 2021-09-01 - 5:01 am

say Wicked Family

MC 808 2021-09-01 - 6:09 am

The model 1 system and CD is still to me one of the most bad ass looking combos I've ever seen.
Right along with the SuperFX and the first FZ-1 3DO made by Panasonic.

gael jehanno 2021-09-01 - 8:04 pm

there is new psu with a brick and 3 connector (MD/MCD/32X). That a blessing to not have 3 power supply that take to much place.

Destrukshawn 2021-09-01 - 11:12 pm

Nice! Subbed 😃

RWL2012 2021-09-03 - 4:39 am

Nope. Fuse will keep blowing. I'll stick with my Mega Everdrive Pro's FPGA Mega CD and my very legal disc images.

angeles2425 2021-09-05 - 12:02 pm

Mega Drive model 2 supports stereo out through the mini din.

Luca Uva 2021-09-05 - 6:51 pm

Something goes wrong, about Megadrive 2 sound output…by rear port, it's stereo and not mono…
Only model 1 has this problem….
But model 2 is cheaper than Mondel 1…but has stereo output!!!
Not good quality sound….but Stereo Sound!!!!

Victor Cruz 2021-09-05 - 9:37 pm

The tower of power bro 👍🏽

Chris Stokes 2021-09-06 - 2:38 pm

Original hardware with Original software wins every single time because of one huge part people underestimate…..nostalgia.

Tom 2404 2021-09-12 - 12:53 pm

The official name should be Sega Mega CD Drive

Luis Reyes 2021-09-18 - 6:27 pm

I bet finding good games for the SEGA CD (and by GOOD games I mean NO garbage FMV games) is a pain in the arse. 😅

Guilherme Solda 2021-09-21 - 4:47 pm

it looks like is a upgrade on sound changing from the yamaha ymf sound chip from sega genesis to a yamaha xg midi module/midi synth. maybe it is incorporated on the cd part.

Ilija Bosnjak 2021-09-24 - 7:27 pm


黒井カイKai Kuroi 2021-09-26 - 4:55 pm

I've recently stumbled on to my old Sega Mega Drive 2 from Singapore, while clearing the storeroom with my Dad. So happy that it's an authentic real deal Mega Drive 2. Now I want to get the Mega CD 2 add-on.

Vandelay Industries 2021-09-30 - 8:55 am

"Light is blinking over here. It wants to have some food!" 😂

Random Retro plays 2021-10-11 - 3:46 am

The Sega megadrive is my favourite console of all time ( original model is best) , seeing you do a review on this system was great fun. Also with the best titles to play. Yes sol-feace is a great shooter on the mega CD. Awesome video wicked 🔥🔥🔥🔥🔥👍. Its sounds beautiful and looks great . my 1st time hearing final fight CD soundtrack , its awesome. I want one 😁

CJ Fox 2021-10-21 - 2:11 pm

I found a mega cd 2 in a charity shop recently for 4 pounds funny looking at the prices people are selling them for online i have a question do i need to have both power supply bricks plugged in or just one its weird i cant get a straight answer looking online

Juh-Roon 2021-11-14 - 8:59 am

Nooit een Mega CD gehad, maar eergisteren een mooi exemplaar (inclusief de Megadrive II) boxed op de kop kunnen tikken. Een paar games zijn al onderweg. Net als jou ben ik eerder fan van het eerste model vd Megadrive (ook puur jeugdsentiment), maar ik kijk hard uit om es m'n tanden in die MCDII te zetten. Mooie vid! Groeten uit België.

William Ashton 2021-11-18 - 2:48 pm

Love watching your videos man keep up the good work

Life Leak 2022-01-20 - 2:42 am

Him: “Is it worth buying?”

thierrydesu 2022-01-26 - 5:37 am

If it wasn't worth buying in 1993, it can't be worth now.

JETIX FILO 2022-01-29 - 3:54 am

9:28 I have The same TV me too!

poep eter 2022-01-30 - 3:40 pm

Offcourse it is
With all the hacks nowadays…
Game on!

Joe Evans 2022-02-17 - 9:45 am

Just purchased a mega cd 2 from ebay,cant wait to play the oldies again.thing is i had mega cd mark 1 back in the 90s and loads of great games including the awsome robo eleste!!

Footgoal 2022-03-06 - 4:10 pm

I loved the sega mega cd11! I played hockey and sonic on it, great times!

Zebitus 2022-07-13 - 7:59 am

Do you know if the US Genesis Gen 1 and Gen 2 works on a Mega CD?

Mike Kanner 2022-08-25 - 5:04 pm

How is it worth buying when now you can just hack the games second it’s no longer the most powerful consoles the time has past by were in 2022 with the PS5 Xbox series X Nintendo Switch that can play these games even better go buy the Sega Genesis Mini for $79.99 then just hack it you can find other hardwares that reads Sega Genesis cartridges plus can read NES and Super Nintendo cartridges 3 in one

Jimmy Brooks 2023-01-04 - 3:41 pm

I tell you, Nay: but, except ye repent, ye shall all likewise perish. (Luke 13:5)
But we are all as an unclean thing, and all our righteousnesses are as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away. (Isaiah 64:6)
As it is written, There is none righteous, no, not one: There is none that understandeth, there is none that seeketh after God. They are all gone out of the way, they are together become unprofitable; there is none that doeth good, no, not one. (Romans 3:10-12)

Camila Quijije 2023-03-20 - 10:02 pm

iLove Sonic

Τιμολέων Παναγιωτίδης 2023-03-22 - 12:11 pm

Like,very like, very very 👍 like!

Tom Bonnett 2023-04-01 - 6:58 am

Set the TV to 4:3 dude, looks so bad stretched out like that.

Retroblitz 2023-04-16 - 6:56 am

Not sure if anyone has already mentioned it but the Megadrive 2 has stereo sound built in, not mono. Shame they dropped the headphone jack though. At least they put stereo via the AV out, that's why it uses a different AV port.


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