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. WW: December 1995Media,@ 1.79 MHz or 7.16 MHzMemory8KB work, 64KB video RAM, 192KB additional memory (System 3.0)Display256 × 224, 512 × 224, 512 × 240 screen resolutions. 512 available colors, 481 on-screen colorsSound6 PSG audio channelsInputPredecessor(PC Engine)TurboGrafx-CD (CD-ROM² System)SuccessorThe TurboDuo is a developed by and for the North American market.
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The TurboDuo, released in October 1992, is the North American version of the PC Engine Duo, Japanese game console released in September 1991.In the United States, the TurboDuo was marketed by Turbo Technologies, Inc. (or TTI) of, a joint venture of. It was established to market NEC consoles in North America after NEC Home Electronics USA failed to effectively market the platform.The TurboDuo integrates the capabilities of the and its (the TurboGrafx-CD) into a single, redesigned unit with an updated and 192 KB of additional RAM. TTI also offered the Super System Card via mail order, which provided the original TurboGrafx-CD with the 192 KB RAM upgrade.The RAM increase and BIOS update afford the TurboDuo and PC Engine Duo compatibility with all CD-ROM² and Super CD-ROM² titles (Japanese and North American). Like the, the TurboDuo can read and discs. The TurboDuo, however, cannot read PC Engine HuCards without modification or an adapter.
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With a HuCard adapter and an Arcade Card Duo, the TurboDuo can also read Arcade CD-ROM² games (which were sold only in Japan). The Japanese PC Engine Duo RNEC later revised the design of the console to reduce both manufacturing costs and the sale price. This new version, the PC Engine Duo R ( PCエンジンDuo-R, Pī Shī Enjin Duo Āru), went to market on March 25, 1993 with a retail price of ¥39,800. The Duo R omits the for, and the locking switch for the lid of the Duo's CD-ROM drive.
The Duo R has an off-white, differently shaped chassis.NEC released its final variation of the PC Engine Duo on June 25, 1994. The PC Engine Duo RX ( PCエンジンDuo-RX, Pī Shī Enjin Duo Āru Ekkusu) has a bluer chassis, and was bundled with the Arcade Pad 6, a six-button controller, instead of the standard Turbo Pad controller.In a game console comparison published in May 1995, rated the PC Engine Duo 22 out of 40. North America TTI released the TurboDuo to consumers in North America in October 1992, at a retail price of US$299.99. The price was, in part, a consequence of the relatively high cost of CD-ROM drive manufacturing.Since TTI understood that the price was too high for many people in their, they included a booklet of for TurboDuo games and accessories, plus several on two CD-ROMs: (1990) and a Super CD compilation of four of Hudson Soft's more popular TurboGrafx-16 titles: (1989), (1991), (1992), and (1983). ( Bomberman was hidden in an.) The package also included one TurboChip game: (Hudson Soft 1989). Later, TTI replaced Dungeon Explorer with one of a variety of TurboChip titles, such as ( 1988) and ( 1989).With the release of the TurboDuo, TTI reduced the retail price of the TurboGrafx-CD peripheral for the TurboGrafx-16 to $150.00, and began marketing the Super System Card, which enabled the TurboGrafx-CD to play the new Super CD games. The Super System Card is programmed with the updated v3.0 BIOS, and increases the TurboGrafx-16's RAM by 192 kilobytes.
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The TurboGrafx-CD requires the updated BIOS to read Super CD discs, and the additional RAM to run the software capably. The Super System Card retailed for US$65 or, when bundled with the TurboDuo's Super CD compilation disc, US$95.For the TurboDuo marketing campaign, TTI used a character called.
In 1998, Jonathan J. Burtenshaw of described the advertising campaign as 'petty' and 'overly confrontational,' and conjectured that the campaign hurt TurboDuo sales. Technical specification. The Japanese PC Engine Duo CPU The is a modified with an effective of 1.79 or 7.16 MHz (switchable by software). The integrated components of this 8-bit processor include a timer, general-purpose I/O port, and bankswitching hardware (which drives a 21-bit external address bus from a 6502-compatible 16-bit address bus). It is capable of block transfer instructions, as well as dedicated move instructions for communicating with the TurboDuo's, the. Video processing.
One 16-bit video color encoder (VCE). One 16-bit video display controller (VDC). Like the TMS99xx family of video display processors, it has port-based I/O.Display resolution.
Horizontal lines: Maximum of 512, programmable in 8-pixel increments. Vertical lines: Maximum of 240, programmable in 8-pixel incrementsNearly all TurboGrafx-16 games use 256×224. Sherlock Holmes Consulting Detective did use 512×224. Since the TurboGrafx-16 used a different controller port, its input devices and peripherals required an adapter in order to be used on a TurboDuo. Color.: 9-bit.
512-color palette (maximum of 481 colors on-screen: 241 for background tiles, 240 for ). Up to 32 palettes (16 for background tiles, 16 for sprites). Up to 16 colors per paletteSprites. Sizes: 16×16, 16×32, 32×16, 32×32, 32×64. Simultaneously displayable: 64 (maximum of 8–16 per line, depending on sprite width). Each sprite can use up to 15 unique colors (one color must be reserved as transparent) via one of the 16 available sprite palettes. The HuC6270A VDC can display one sprite layer.
Sprites could be placed either in front of or behind background tiles.Tiles Each 8×8-pixel background tile can use up to 16 unique colors via one of the 16 available background palettes. The first color entry of each background palette must be the same across all background palettes.
The HuC6270A VDC can display one background layer. Memory. Work RAM: 8 KB. Video RAM: 64 KB. Additional 192 KB of built in Memory (System 3.0)Sound. Six PSG audio channels, programmable through the CPU. One ADPCM channel.Software media.
TurboChip (called HuCard in Japan), a thin, card-like. Published games consumed up to 20 (2.5 ). CD-ROM² (pronounced 'CD-ROM-ROM' in Japan), a proprietary -based media. Unlike the TurboGrafx-CD add-on, the TurboDuo could play standard CD-ROM² discs, as well Super CD-ROM² discs, without the need of a System Card.
Early CD-ROM² games released in North America were branded as TurboGrafx-CD discs, but this relabeling fell into disuse after the launch of the TurboDuo in favor of keeping the CD-ROM² and Super CD-ROM² labeling used in Japan.See also.References.