Teletext systems expensive cost of NABTS decoders, costing in the thousands of dollars upon their release to the public. NABTS, however, was adopted for a short while by American TV networks NBC & CBS throughout the early-to-mid 80s, CBS using it for their short-lived ExtraVision teletext service, which premiered after the early Antiope & Ceefax trials by CBS & KNXT, and NBC, who had a NABTS-based service called NBC Teletext for a very short time in the mid-1980s. NBC discontinued their service in 1985 due to the cost of NABTS decoders not dropping to an affordable level for the consumer public. The
TVNZ is still use the former channel programs). TVNZ began a teletext service in 1984 originally with the intention to help New Zealand's deaf community get improved access to news and information. A captioning service was available for certain television shows and could be accessed by browsing to page 801. The TVNZ Teletext service could be received on all TVNZ channels and the TVNZ service could be received on TV3 including captioning of some TV3 shows. Trackside also operated a Teletext service called TAB Text which only displayed the racing pages of Teletext. A Teletext capable television was usually required to