
Sega Master System
Sega's 8-bit console that competed with the NES. Popular in Europe and Brazil with excellent arcade ports and original titles.
Technical Specifications
CPU
Zilog Z80A @ 3.5796 MHz (identical clock speed to MSX and ColecoVision)
GPU
Yamaha YM2602B VDP (Video Display Processor), based on Texas Instruments TMS9918 architecture with significant Sega enhancements; supports hardware scrolling, 64 sprites (8 per scanline), tile-based backgrounds
Memory
8 KB main RAM, 16 KB VRAM (dedicated Video RAM for tile data, sprite attributes, and palette)
Storage
ROM Cartridge (up to 512 KB / 4 Mbit standard), Sega Card (up to 32 KB / 256 Kbit, smaller form factor), battery-backed SRAM in select cartridges for save data
Display
Resolution: 256x192 (legacy mode), 256x224 (extended mode), 256x240 (PAL only); 32 colors on screen from 64-color palette (6-bit RGB, 2 bits per channel); 8x8 pixel tile-based background, 64 simultaneous sprites (8x8 or 8x16 pixels)
Audio
Texas Instruments SN76489 PSG (Programmable Sound Generator): 3 square wave tone channels (each with 10-bit frequency and 4-bit volume control) + 1 white noise channel; optional Yamaha YM2413 OPLL FM synthesis unit (Japan/Mark III only): 9 FM channels or 6 FM + 5 rhythm channels
Media
Sega Master System Cartridge (50-pin, top-loading), Sega Card (thin credit card-format ROM, front-loading via card slot), 3D Glasses via card slot adapter
History
Hardware Variants
Sega Mark III (Japan)
Released: October 20, 1985
The original Japanese model with a more angular design and card slot. Featured both cartridge and Sega Card slots plus an expansion connector for the FM Sound Unit.
Master System Model 1 (MK-2000, worldwide)
Released: June 1, 1986
The Western redesign with a larger, sleeker case. Included built-in Snail Maze hidden game, 3D glasses port, card slot, and cartridge slot. Power base design with red accents.
Master System II (MK-3006)
Released: January 1, 1990
A cost-reduced, compact redesign removing the card slot, expansion port, reset button, and 3D glasses support. Later models had Alex Kidd in Miracle World or Sonic the Hedgehog built into ROM.
Master System III (Tec Toy, Brazil)
Released: January 1, 1998
Brazil-exclusive compact redesign by Tec Toy. Continually updated with new built-in game compilations. Remarkably, still manufactured and sold in Brazil in updated forms into the 2020s.
Master System Girl (Tec Toy, Brazil)
Released: January 1, 2009
A pink-colored variant by Tec Toy marketed toward female gamers in Brazil, featuring a compact design with built-in games including Monica in the Castle of the Dragon.
Development Story
About the Sega Master System
The Sega Master System (SMS) is a home video game console manufactured by Sega. Released on October 20, 1985, it belongs to the 3th generation of gaming hardware.
With a library of 50+ games, the SMS remains one of the most popular platforms for retro gaming enthusiasts. Our wiki provides detailed information about the hardware specifications, variants, and game library to help you understand and appreciate this classic gaming system.
Whether you're researching emulation compatibility, collecting vintage hardware, or simply exploring gaming history, the SMS encyclopedia entry offers comprehensive information about this iconic gaming platform.











