The Z86129/130/131 is a stand-alone integrated circuit, capable of processing Vertical Blanking Interval (VBI) data from both fields of the video frame in data conforming to the transmission format defined in the Television Decoder Circuits Act of 1990 and in accordance with the Electronics Industry Association specification 608 (EIA-608). The Line 21 data stream can consist of data from several data channels multiplexed together. Field 1 has four data channels, two Captions and two Text. Field 2 has five additional data channels, two Captions, two Text and Extended Data Services (XDS). XDS data structure is defined in EIA-608. The Z86129 can recover and display data transmitted on any of these nine data channels. The Z86130 and Z86131 are derivatives of the Z86129 which can recover XDS data and output the recovered data via the serial port. The Z86130 and Z86131 do not have OSD