Sega Master System (SMS)
Sega Master System (SMS) is an 8-bit game console, released by Sega in 1986 in the US and 1987 in Europe and Japan.
In June 1986, Sega Master System appeared in the United States and for the first four months has sold about 125 thousand of the consoles at the price of $ 200, while over the same period, Nintendo sold 2 million NES. Nintendo held 90% of the market, whereas the Master System, Atari 7800 and INTV were content with the remaining 10%. In 1988, all that concerned the Master System in the United States, gave the company Tonka, which was to boost sales and popularity of consoles. And this resulted in a complete failure.
In 1990, Sega of America has revoked all rights to Sega Master System from Tonka. The console was thoroughly revised and published as the Sega Master System II, which was just a games console and nothing more. Were removed: built-in Game Card, extra lights, Reset button, expansion port, BIOS (with built-in instructions and a mini-game).
8-bit Zilog Z80A:
- The clock frequency of 3.54 MHz (in consoles for the TV standards PAL/SECAM), of 3.57 MHz (in consoles for NTSC).
VDP (Video Display Processor) similar to the Texas Instruments TMS9918:
- Simultaneously 16 colors for sprites and 16 for background from the palette to 64 colors.
- Resolution 256×192 and 256×224. PAL/SECAM also supports 256×240.
- The background tiles of 8×8 pixels, not more than 488 different tiles (the size limit of video memory).
- Sprites of size 8×8 or 8×16 pixels, 64 sprites.
- Hardware scrolling (scroll) the screen in all directions. Possible partial scrolling.
It is possible to connect stereo glasses (supported in a few games).
Texas Instruments SN76489:
- Four-channel PSG (Programmable Sound Generator the programmable sound generator).
- Three channels with a square waveform, one noise channel.
- Programmable tone/noise and attenuation.
In the version of Sega Mark IV (released in Japan) features additional audio chip is the Yamaha YM2413, playback 9 channel FM music (only supported in some games).
- BIOS ROM: 64 kbit (8 KB) to 2048 kbit (256 KB), depending on built-in games.
- Main RAM: 64 kbit (8 KB), can expand.
- Video memory: 128 kbit (16 KB).
- Slot Game Card (not available in the Master System II).
- The Game Cartridge Slot:
- Japanese and South Korean variants use 44-pin cartridges, the same SG-1000 and Mark II.
- Versions for other regions use 50-pin cartridges.
- An expansion slot.