Nec pc 98 games
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PC-9801VM was the first model supports 8 (16) colors chosen from 4096 colors with 8+256KB video RAM, but 16 colors was supported by using an optional video RAM board ( PC-9801-24). It supports accessing multiple graphic planes at the same time, makes faster filling a bitmap.
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In 1985, NEC introduced a graphics accelerator chip specialized for PC98 that is called "Graphic Charger", also known as "GRCG". In 1983, NEC shipped out the PC-9801F which contained twice video RAM for more graphic pages, JIS Level-1 character set Kanji font ROM and additional 4KB text RAM for double-byte characters. If an optional kanji ROM board (PC-9801-01 or -10) is installed, it can display 3,000 or more kanji characters quickly. It can only display Latin alphabetic, numeric and katakana characters (ANK文字). The first PC-9801 contains two uPD7220A (run at 2.5MHz), the one and 8KB video RAM for text, the other and 96KB video RAM for graphics. The uPD7220 was also used in DEC Rainbow, Tulip System-1 and Number Nine's video card for the IBM PC. It was exported to the United States as the APC (Advanced Personal Computer). This machine is an all-in-one desktop computer and its display resolution is 640×475 pixels, but its architecture is similar to PC98. First, it was used in their small business computer "N5200 model 05" released in the same year. In 1981, NEC introduced the uPD7220, one of the first computer GPU. GDC (Graphic Display Controller, μPD7220)