Inexpensive home computers had been first introduced in 1977 and, by 1979, Atari unveiled the Atari 400 and 800 computers, built around a chipset originally meant for use in a game console, and which retailed for the same price as their respective names. In 1981, IBM introduced the IBM 5150 PC with a $1,565 base price (), while Sinclair Research introduced its low-end ZX81 microcomputer for £70 (). By 1982, new desktop computer designs were commonly providing better color graphics and sound than game consoles and personal computer sales were booming. The TI 99/4A and the Atari 400 were both at $349 (), the Tandy Color Computer sold at $379 (), and Commodore International had just reduced the price of the VIC-20 to $199 () and the C64 to $499 ().