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Old 13th Dec 2020, 11:48 pm   #3
Join Date: Apr 2005
Location: Ipswich, Suffolk, UK.
Posts: 31
Default Re: Homemade Teletext decoder (based on Mullard Module)

Thanks for heads up on the Television articles. I can't remember where I bought the module from but 15-20 seems right. Most of the design in the Television adapter is about the the keyboard interface. I used an EPROM to map from the 4x4 telephone keypad to the 7-bit code that the Mullard required as shown in the Dec 1986 article (I was limited to 14 different codes so picked what I thought were the most useful). As my TV had RGB + sync + blanking input there was no need for a UHF modulator. It really was a hack but it worked well.

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