Sega · Game Console · 1987
Sega Master System
Sega master system: Zilog Z80A, 8-bit, rated for 4 MHz but runs at approximately 3.58 MHz, ROM cartridges (Mega Cartridges) held up to 4 Mbit (512 KB) of code/data storage. Released in 1985.
- Chipset
- Zilog Z80A, 8-bit, rated for 4 …
- Resolution
- 256 x 192 pixels
Master System II (3006)Master System (3010)
Audio
- FM audio
- Japanese Master System (Oct 23, 1987) added a built-in FM audio chip (Yamaha YM2413)
- Sound chip
- Texas Instruments SN76489 Programmable Sound Generator (PSG)
Media
- Slots
- Two game input slots (cartridge slot and Sega Card slot), plus an expansion slot and two controller ports
- Formats
- ROM cartridges and credit-card-sized Sega Cards
Memory
- RAM
- 8 KB
- VRAM
- 16 KB, accessible only by the VDP via a 16-bit data bus
- Card storage
- Sega Cards held up to 256 Kbit (32 KB)
- Cartridge storage
- ROM cartridges (Mega Cartridges) held up to 4 Mbit (512 KB) of code/data
Graphics
- VDP
- Custom Video Display Processor designed by Sega for the Mark III, internally based on the Texas Instruments TMS9918 design (as used in the SG-1000) with added enhancements
- Resolution
- 256 x 192 pixels
- Video output
- RF switch standard; Model 1 units with AV port also support composite and RGB video
Physical
- Dimensions (Master System)
- 365 mm x 170 mm x 70 mm (14.4 in x 6.7 in x 2.8 in)
- Dimensions (Sega Mark III)
- 318 mm x 145 mm x 52 mm (12.5 in x 5.7 in x 2.0 in)
Processor
- CPU
- Zilog Z80A, 8-bit, rated for 4 MHz but runs at approximately 3.58 MHz
Parts documented to fit this model — fitment grade and repair difficulty. Supplier listings are rolling out; “Find suppliers” searches the marketplace today.
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