|Fast facts on Sega Mega-CD|
The Sega Mega-CD (メガＣＤ), known as the Sega CD in North America and Brazil, and CD Aladdin Boy (CD 알라딘 보이) in South Korea, is a hardware add-on developed by Sega for the Sega Mega Drive. As the names suggest, it allows a Mega Drive to run compact discs, be it proprietary Mega-CD software, audio CDs or CD+G discs. It also acts as an upgrade to the Mega Drive hardware, sporting an extra processor and extra RAM. The Mega-CD was first released in 1991 and was supported alongside regular Mega Drive cartridges.
The Mega-CD comes in many forms, but in all cases the hardware adds the capability of reading compact discs, technology which in the late 1980s and early 1990s, was becoming a more affordable storage option than the traditional video game ROM cartridge of previous console generations.
A traditional Mega-CD does not act as a stand-alone unit, and needs to be hooked up to a Mega Drive via the expansion port located on the right hand side of the console. Mega-CDs do, however, require their own AC adaptor, meaning that in order to play Mega-CD games, two sockets will be occupied by the upgraded console.
Though one would expect the Mega-CD to simply give the Mega Drive access to compact discs, it in fact adds extra processors, memory and audio features as well, all of which can only be utilised by CD software. The Mega-CD does not, however, solve the issue of graphics, which aside from the ability to scale and rotate sprites on the fly, remain identical to the standard Mega Drive system.
The Mega-CD also offers stereo sound RCA connectors. The Mega Drive on its own will output a monaural audio signal to the television, with stereo only being available through the headphone port located at the front of the console. An external connection from the Mega Drive to the Mega-CD will allow all games to play through the television in stereo.
Like the Mega Drive, there were two major revisions of the add-on by Sega and several special combination units.
The original Mega-CD utilises a CD tray, and sits underneath the Mega Drive (or Mega Drive 2). It is a reasonably large add-on designed to be permanently attached to the console at all times.
A cost-reduced model of the Mega-CD was produced and released around the same period as the cost-reduced Mega Drive 2. This version sits on the right hand side of the Mega Drive, though continues to act as a new base for the console, and is a top-loading device. Fewer mechanical parts means less is likely to go wrong with a Mega-CD 2, and is designed to look sleeker and more appealing. The Mega-CD 2 is designed primarily with the Mega Drive 2 in mind, however a plastic extension piece was included to add extra support with an original Mega Drive attached.
Combination Mega Drive/Mega-CD units were developed over the course of the Mega-CD's lifetime. The Wondermega and LaserActive are standalone consoles; the LaserActive also plays LaserDiscs. The Multi-Mega is a portable audio CD player that can play Mega Drive and Mega-CD games when plugged in to wall power and a TV. The Aiwa Mega CD is a Mega Drive/Mega-CD packed into Aiwa's consumer-level portable CD stereos.
The SNASM Mega CD is a fully featured debugging system developed by Cross Products and officially licensed by Sega for Mega-CD debugging and development. Its features include a debugging interface through a port on the rear of the system as well as CD-ROM emulation through a proprietary SCSI card. The system contains a modified boot-rom which includes all used region combinations for localized debugging. Also available to developers are a number of controls for both the main and sub 68000 CPUs in the Mega-CD. The SNASM Mega CD is used with the SNASM2 family of development programs and Cross Products's SN Server.
Psygnosis, a prominent 3rd party developer, developed their own tools for use with the systems which they developed for, including the Mega-CD. The PsyQ development software includes the popular ASM68K and can be used with the Cross Products Mega CD.
The following are upgrades over the Sega Mega Drive technical specifications.
The Mega-CD adds 10 sound channels to the 10 provided by the Mega Drive's sound chips.
(Above specs prior to compression)
|Boot ROM Version||Machine||Download||CRC32|
|0.98||Pioneer LaserActive||0.98 (NA) (info) (88 kB)||8c3e3945|
|0.98 (Asia) (info) (87 kB)||9f5771d2|
|1.00|| Sega/Mega CD Model 1
Victor WonderMega 1 (Asia)
Sega WonderMega (Asia)
|1.00g (Asia, NTSC) (info) (80 kB)||3beb1ac2|
|1.00l (Asia, NTSC) (info) (84 kB)||f18dde5b|
|1.00o (Asia, NTSC) (info) (80 kB)||1d9756a3|
|1.00p (Asia, NTSC) (info) (85 kB)||9d2da8f2|
|1.00s (Asia, NTSC) (info) (84 kB)||79f85384|
|1.00s (Asia, PAL) (info) (85 kB)||550f30bb|
|1.00w (Sega WonderMega Bios) (info) (84 kB)||d21fe71d|
|1.00 (NA) (info) (90 kB)||e7e3afe2|
|1.00 (EU) (info) (88 kB)||529ac15a|
|1.04||Pioneer LaserActive||1.04 (NA) (info) (88 kB)||2ed602d7|
|1.05||Pioneer LaserActive||1.05 (Asia) (info) (81 kB)||b24b919d|
|1.10||Sega CD Model 1 (minor update)||1.10 (NA) (info) (92 kB)||c6d10268|
|2.00|| Sega/Mega CD 2
Victor WonderMega 2 (Asia)
JVC X'Eye (NA)
|2.00 (1st NA version) (info) (92 kB)||8af65f58|
|2.00w (2nd NA version) (info) (92 kB)||9f6f6276|
|2.00c (Asian version) (info) (85 kB)||dd6cc972|
|2.00 (1st EU version) (info) (90 kB)||0507b590|
|2.00w (2nd EU version) (info) (90 kB)||4d5cb8da|
|2.00 (X'Eye) (info) (86 kB)||290f8e33|
|2.00 (Wondermega) (info) (173 kB)||2b19972f1|
|2.11||Sega/Mega CD 2, Aiwa CSD G1M (Japan)||2.11w (NA) (info) (93 kB)||2e49d72c|
|2.11c (JP) (info) (86 kB)||12154531|
|2.21||Sega Multimega (Europe & Japan), CDX (North America), Linguaphone Education Gear (Japan)||2.21x (MultiMega, EU) (info) (91 kB)||aacb851e|
|2.21x (CDX) (info) (92 kB)||d48c44b5|
1 The ZIP file contains two dumps, a "good" dump and a "bad" dump. The "bad" dump has an incorrect HINT vector, but is otherwise identical to the "good" dump. The CRC32 listed here is for the "good" dump.
Dimensions: 301mm x 212.5 x 112.5
Weight: 1.4 kg (3.1 lbs)
The five games marked with an asterisk(*) were later released in enhanced form, requiring both the Mega-CD and 32X to be played, and taking advantage of the latter's improved graphics (see Sega Mega-CD 32X).
|Sega Mega Drive Hardware|
|Console Variations||Japan | North America | Europe | Brazil | Asia | South Korea | Australia|
|Add-ons||Mega-CD (Multi-Mega | Wondermega | CSD-G1M) | 32X (Mega-CD 32X)
Demo System DS-16 | ERX 308P | ERX 318P| Master Mega Converter | MD 8bit Converter | Mega/Master Adaptor | Mega-CD Karaoke | Mega Modem | Nomad PowerBack | Power Base Converter | Pro MegaMaster | Sprobe | Super Magic Drive
|Controllers||Control Pad | Six Button Control Pad | 6 Button Arcade Pad | Arcade Power Stick 6B | Konami Justifier | MK-1470|
|Network Services||Sega Channel | Sega Meganet (Sega Game Toshokan) | Tectoy Mega Net | Telebradesco Residência | XB∀ND|
|Misc. Hardware||4 Way Play | Action Replay | Cartridge Caddy | Cartridge Soft Pak | Cleaning System | Control Pad Extension Cord | Double Pro Fighter | Everdrive MD | Game Cartridge Organizer | Game Genie | Game Wizard | Genipak | Genesis Speakers | Interceptor Mega Disk | Magicard | Region converter cartridges | Mega Everdrive | Mega Anser | Mega Terminal | Miracle Piano Teaching System | Multi Game Hunter | Power Plug | Megaverter | RetroGen | RF Unit (Mega Drive 2) | SCART Cable (Mega Drive 2) | Sega Power Strip | Stereo Audio Video Cable | StuntMaster | Super Multi-play | Team Player | Tototek MD-Pro | Video Game Organizer | Video Entertainment Center | Video Entertainment Cabinet | Video Monitor Cable|
|Unreleased Hardware||Floppy Disk Drive | Video Jukebox|
|Consoles on a Chip||
Arcade Blast | Arcade Classic | Arcade Master | Arcade Motion Classic | Arcade Motion Dual | Arcade Nano Series | Arcade Portable | Arcade Ultimate | Genesis Gencore | GenMobile | Mega Drive Twin Pads
|Sega Home Video Game Systems|
|SG-1000||SG-1000 II||Mega Drive||Mega Drive II|
|SC-3000||Mega-CD||Mega-CD II||Genesis 3|
|Sega Mark III||Saturn|
|Master System||Master System II|