NAPLPS

NAPLPS (North American Presentation Level Protocol Syntax) is a graphics language for use originally with videotex services. It is unclear if it was ever used in this role, although the basics of NAPLPS were later used as the basis for several other microcomputer based graphics systems.

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In the mid 1970s a number of firms were rolling out videotex services, although the most popular by far would be in England. Character codes are sent to users' televisions by encoding them as dot patterns in the invisible "vertical blanking" area just off the top and bottom of the visible portion of the TV signal. A circuit in the TV decoded these signals back into text pages, which the user could select among. The data rate was quite slow, about 600 bit/s, resulting in largely static pages.

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