to develop what they called "K56Flex" or just "Flex".

Both technologies reached the market around February 1997; although problems with K56Flex modems were noted in product reviews through July, within six months the two technologies worked equally well, with variations dependent largely on local connection characteristics.

The retail price of these early 56k modems was about , compared to for standard 33k modems. Compatible equipment was also required at the Internet service providers

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