About: Texas Instruments TMS9918   Sponge Permalink

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The TMS9918 Video Display Processor (VDP) was used in systems like MSX, Coleco Vision, TI-99 and Sega SG-1000/SC-3000. Modified versions with addidional display modes and registers were used in the Sega Master System, Sega Game Gear, and Sega Genesis. Note that the Genesis VDP cannot access any of the TMS9918 display modes discussed below.

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  • Texas Instruments TMS9918
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  • The TMS9918 Video Display Processor (VDP) was used in systems like MSX, Coleco Vision, TI-99 and Sega SG-1000/SC-3000. Modified versions with addidional display modes and registers were used in the Sega Master System, Sega Game Gear, and Sega Genesis. Note that the Genesis VDP cannot access any of the TMS9918 display modes discussed below.
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  • The TMS9918 Video Display Processor (VDP) was used in systems like MSX, Coleco Vision, TI-99 and Sega SG-1000/SC-3000. Modified versions with addidional display modes and registers were used in the Sega Master System, Sega Game Gear, and Sega Genesis. Note that the Genesis VDP cannot access any of the TMS9918 display modes discussed below. There are several variants called TMS9918A, TMS9928A and TMS9929A, where the 'A' indicates a second version of the chip which added new features, most prominently the addition of the Graphic II mode. The non-A version was only used in the TI-99/4; the TI-99/4A and the other computers had the A version VDP. The TMS9918A and TMS9928A output a 60Hz video signal, while the TMS9929A outputs 50Hz video. The difference between the TMS9918A and TMS9928A is that the '1' version outputs NTSC composite, while the '2' versions (including TMS9929A) output YUV (luminance and colour difference signals). The need for the latter was predominant in the 50Hz world, like Europe, due to the plethora of different video signals, like PAL and SECAM. Rather output YUV and encode it to PAL or SECAM in the RF modulator, than try and have a different machine for every country. All these chips are usually generically referred to as TMS9918 (sometimes with an A postfix). The TMS9918A was succeeded by the Yamaha V9938, which added bitmap modes, more colorful sprites, a vertical scroll register and a customizable palette. The V9938 was used in a third-party upgrade to the TI-99/4A - the Geneve 9640 'computer-on-a-card'. The V9938 in turn was succeeded by the V9958, which added some high colour modes and a horizontal scroll register. These chips were only used on the MSX 2 and MSX 2+/turboR systems, although rumor says the V9958 was also used in a generation of the Photo Play arcades. Yamaha also produced a V9990, which is considered the follow-up of the V9958 by some, but it is not backwards compatible. A graphic chip extension utilizing the V9990 exists for the MSX in the form of the 'Graphics9000' cartridge by Sunrise.
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