Reference Materials - ali1234/vhs-teletext GitHub Wiki https://www.etsi.org/deliver/etsi_i_ets/300700_300799/300706/01_60/ets_300706e01p.pdf https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.653-3-199802-I!!PDF-E.pdf https://archive.org/details/video-technical-guide/mode/1up