av:intellivision_pal
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— | av:intellivision_pal [2019/08/27 20:45] (current) – created - external edit 127.0.0.1 | ||
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+ | ====== Mattel Intellivision (PAL Version) Audio/Video Modification ====== | ||
+ | {{av: | ||
+ | This information relevant to the PAL Intellivision version 1. | ||
+ | ===== Video system ===== | ||
+ | Most of the custom ICs have heatsinks glueed on top, making them difficult to identify. Composite video is generated by a LM1889/ | ||
+ | ===== Modification ===== | ||
+ | Here is a circuit diagram of the final parts of the video circuit. \\ {{av: | ||
+ | Red components are additional parts required to make the output suitable for a video monitor. The modification is very easy, only requiring three, easily obtainable parts. There is a significant ammount of dot crawl in the video output (it's present in the RF video too). Unfortunatly this isn't easy to reduce without some complex active filter circuitry. Audio output is an educated guess as my intellivison console has a sound fault. | ||
+ | I did mention that the LM1886 accepts a digital RGB signal from the custom video IC, didn't I? So let's bypass this LM188x crud and build an RGB DAC! \\ {{av: |