Boot ROM
From Sega Retro
There are four Sega systems with meaningful boot ROMs:
Post-1991 Sega Mega Drives also implement the TradeMark Security System when the console boots.
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The Basic Input-Output System or BIOS is computer interface code that locates and loads the operating system into RAM. It provides low-level communication, operation and configuration to the hardware of a system, which at a minimum drives the joypad and provides primitive output to a display. The BIOS is usually written in the Assembly language native to the processor. Listed below is information regarding the attraction modes to Sega's hardware systems, which are the sequences displayed to the end user upon starting up the system.
Sega Master System
Based on the Sega Mark III in Japan, the Sega Master System (SMS) had a BIOS just like any other computer interface. Almost all of Sega's hardware systems had some form startup sequence that graphically told the end user that a game was loaded and ready to play. However, what was unique about SMS was that Sega had included built-in games that could be played without any cartridges inserted.
The first known BIOS released was based upon the Sega Mark III, which featured an animated blue SEGA logo, along with MASTER SYSTEM written underneath. This was a prototype that wasn't released in the final product and is designated as Prototype M404 among emulation communities. (See here for video demonstration)
Among its final release in North America in June 1986, the first major BIOS known publicly is the SEGA startup sequence. The animation sequence this time was the SEGA logo sliding from the left side in the center of the screen, followed by MASTER SYSTEM and its copyright information shown underneath. The trademark SEGA sound as heard in many of the Sonic the Hedgehog games, is also played in the background using melodic system tones (See here). Although less animated, there was an extra hidden game that could played upon startup. By pressing 1, 2 and UP on the controller, the player could play the infamous Snail game.
Japanese releases of the SMS BIOS offered more musical graphical enhancements, along with music from Space Harrier (See here).
Finally, Sega also packaged other games with the system built-in similar to the Snail game, but was no longer hidden to the end user. Depending on the console build and BIOS included with the system, players could choose to play either Hang On, Missile Defense 3-D, and Safari Hunt.