The Tandy 2000 and its special version of MS-DOS supported up to 768 KB of RAM, significantly more than the 640 KB limit imposed by the IBM architecture. While touted as being compatible with the IBM XT, the Tandy 2000 was different enough that most existing PC software that was not purely text-oriented failed to work properly. (Later IBM upgraded the 80286 in new PC AT models to 8 MHz, though with wait states.) The Tandy 2000 was the company's first computer built around an Intel x86 series microprocessor previous models used the Zilog Z80 and Motorola 6809 CPUs. Due to the 16-bit-wide data bus and more efficient instruction decoding of the 80186, the Tandy 2000 ran significantly faster than other PC compatibles, and slightly faster than the PC AT. By comparison, the IBM PC XT (introduced in March 1983) used the older 4.77 MHz Intel 8088 processor, and the IBM PC AT (introduced in 1984) would later use the newer 6 MHz Intel 80286. The Tandy 2000 is a personal computer introduced by Radio Shack in September 1983 based on the 8 MHz Intel 80186 microprocessor running MS-DOS. Optional: monochrome 640 by 400 pixels with intensity bit or 8 RBG colors with intensity, 640 by 400 pixel Text 25 rows by 80 columns, character matrix in RAM is modifiable $2750 (two floppy drives, 128KB RAM), $4250 (2000HD: one drive, 10 MB hard drive, 256KB RAM), $249 extra for monochrome monitorġ0 MB hard drive, 1 or 2 720 KB 5.25" floppies
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