Resources - Emulation - SEGA Mega-CD (SEGA CD)

🗃️ Specifications

📰 Title:	Resources - Emulation - SEGA Mega-CD (SEGA CD)	🕹️ / 🛠️ Type:	Info
🗃️ Genre:	Emulation	👁️ Visual:	Text
🏷️ Category:	Emulation ➤ Engine ➤ SEGA	🏝️ Perspective:	Third person
🔖 Tags:	Documentation; Resources; Emulation; SEGA; mega-cd	⏱️ Pacing:	Real Time
🐣️ Approx. start:		👫️ Played:	Single
🐓️ Latest:		🚦 Status:	11. Documentation (no status)
📍️ Version:	Latest: -	❤️ Like it:	9. ⏳️
🏛️ License type:	🕊️ Libre	🎀️ Quality:	7. ⏳️
🏛️ License:	CC BY	✨️ (temporary):
🐛️ Created:	2011-12-30	🐜️ Updated:	2024-06-17

🚦 Entry status

📰 What's new?:		👔️ Already shown:
💡 Lights on:		💭️ New version published (to be updated):
🎨️ Significant improvement:		🦺️ Work in progress:
🎖️ This work:		🚧️ Some work remains to be done:
👫️ Contrib.:	goupildb & Louis	👻️ Temporary:
🎰️ ID:	12603

📖️ Summary

📜️[en]:	A set of links to resources and / or documentation for the SEGA Mega-CD (SEGA CD) add-on device for the Mega Drive/Sega game console.	📜️[fr]:	Un ensemble de liens vers des ressources ou documentations relatives à l'émulation de l'extension SEGA Mega-CD (SEGA CD) pour console de jeu SEGA Megadrive.

🎥️ Videos

🎮️ Showcase:

📕 Description [en]

📜️ "blabla" 📜️

A set of links to resources and / or documentation for the SEGA Mega-CD (SEGA CD) add-on device for the Mega Drive/Sega game console.

🌍️ Wikipedia :

The Sega CD, originally released as the Mega-CD, is an add-on device for the Mega Drive/Sega Genesis video game console, designed and produced by Sega. It was released in Japan in 1991, North America in 1992 and in Europe and other regions in 1993. The device adds a CD-ROM drive to the console, allowing the user to play CD-based games and providing additional hardware functionality. It can also play audio CDs and CD+G discs.

In early 1991, Sega announced the Mega-CD for release in Japan in late 1991, North America (as the Sega CD) in 1992, and in Europe in 1993. While the add-on did contain a faster central processing unit than the Genesis, as well as some enhanced graphics capabilities, the main focus of the device was to expand the size of games. Sega of Japan, partnering with JVC, refused to consult with Sega's American division until the project was completed—Sega of America had to assemble parts from various "dummy" units to obtain a working prototype. While it became known for several games such as Sonic the Hedgehog CD and for the controversy of violent video games including Night Trap, the expansion only sold as many as 6 million units worldwide and was often criticized for its severe hardware limitations.

Technical aspects and specifications

The Sega CD can only be used in conjunction with a Genesis system, attaching through an expansion slot on the side of the main console. Though the Sega CD is an add-on, it does require its own separate power supply. In addition to playing its own library of games in CD-ROM format, the Sega CD can also play compact discs, karaoke CD+G discs, and can also be used in conjunction with the Sega 32X to play 32-bit games that utilize both add-ons. The second model, also known as the Sega CD 2, also includes a steel joining plate to be screwed into the bottom of the Genesis, as well as an extension spacer to work with the original model of the Genesis.

The main CPU of the Sega CD is a 12.5MHz 16-bit Motorola 68000 processor, which runs 5 MHz faster than the Genesis processor. It contains 1 Mbit of boot ROM, allocated for the CD game BIOS, CD player software, and compatibility with CD+G discs. 6 Mbit of RAM are allocated to data for programs, pictures, and sounds; 512 Kbit to PCM waveform memory; 128 Kbit to CD-ROM data cache memory; and an additional 64 Kbit are allocated as backup memory. Audio is supplied through a PCM sound source, and two RCA pin jacks allow the Sega CD to output stereophonic sound separate from the Genesis. Combining stereo sound from a Genesis to either version of the Sega CD requires a cable between the Genesis's headphone jack and an input jack on the back of the CD unit. This is not required for the second model of the Genesis. Two graphics chips included in the Sega CD serve to add scaling and rotation as capabilities of the system.

Though the Sega CD offers a faster processor and can handle more colors than the Genesis, its main purpose is to expand the size of the games. Whereas ROM cartridges of the day typically contained 8 to 16 megabits of data, a CD-ROM disc can hold more than 640 megabytes of data, or more than 320 times the storage of a Genesis cartridge. This allows the Sega CD to run games containing full motion video.

📕 Description [fr]

Un ensemble de liens vers des ressources ou documentations relatives à l'émulation de l'extension SEGA Mega-CD (SEGA CD) pour console de jeu SEGA Megadrive.

Le SEGA Mega-CD (SEGA CD) est un lecteur de CD-ROM externe pour la console SEGA Megadrive.
Selon wikipedia, sa ludothèque est essentiellement composée de titres existants auxquels ont été ajoutés des modifications mineures (bande son remasterisée et vidéo).

🌍️ Wikipedia :

Le Mega-CD, ou Sega CD en Amérique du Nord, est un périphérique destiné à la console de jeu vidéo Megadrive de Sega. Il s'agit d'un lecteur de CD-ROM permettant de lire des jeux au format CD-ROM, des CD Audio et des CD-G. Il fut commercialisé fin 1991 au Japon, en 1992 aux États-Unis et en 1993 en Europe.

Spécifications techniques
Carte mère du Mega-CD
Processeur principal

• Motorola 68000, cadencé à 12,5 MHz

Graphisme

• Processeurs graphiques : ASIC
• Nombre de couleurs simultanées sur l'écran :
⚬64 (cette limite peut grimper jusqu'à 128 couleurs par l'intermédiaire du mode « Hold And Modify » HAM)
⚬128 à 256 couleurs disponibles dans les modes Cinepak et de TruVideo
• Résolution : 320 x 224 pixels et 256 x 224
• Effets de sprite, tels que l'agrandissement et la rotation

Mémoire

• Mémoire principale: 512 Ko
• Mémoire cache du lecteur CD : 128 Kbit
• Mémoire de sauvegarde : 64 Kbit

Stockage

• Taux de transfert du lecteur CD : 150 ko/s (1x)
• Stockage : CD-ROM de 500 Mo (équivalents à 62 minutes de données audio, entre 1,5 et 4 heures de vidéo d'1/4 d'écran en noir et blanc, et 45 minutes en couleurs)

BIOS

• Taille : 1 Mo
• Temps d'accès moyen : 800 ms
• Mise à jour logicielle

Son

• 🎧️ Son : Le Mega-CD ajoute 10 canaux sonores supplémentaires au SPU existant de la Megadrive (le YM2612).
⚬8 canaux PCM stéréo
⚬Mémoire sonore PCM : 64 Ko
⚬Taux d'échantillon maximum : 32 KHz (44,1 kHz pour CD-DA) 16 bit
⚬Filtre numérique de suréchantillonage interne, 8x
⚬Plage de fréquence : 20 Hz - 20 KHz, rapport signal/bruit : > 90 dB à 1 KHz, séparation des canaux : 90 dB

Autres

• Sorties : RCA stéréo, péritel
• Dimensions : 301 x 212,5 x 112,5 mm
• Poids : 1,4 Kg

💡 Nota:
• La copie d'écran provient du site Wikipedia (licence Public domain).
• Attention : le téléchargement de ROMS commerciales est illégal à moins de les avoir acquises financièrement.