The MIST can be connected to a SCART TV (NOTE: FULL SCART - it means it must accept RGB SIGNAL). This must be supported by the running core and the core must generate a TV-compliant RGB signal with the appropriate composite sync in order to allow the TV to correctly pick up the signal. The video signal must be a 15kHz/50Hz PAL signal.
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The generation of a SCART TV (15khz) compliant signal is typically enabled by the following line in the MIST.INI (see the INI file documentation):
The scandoubler is the component inside the Core that converts the standard TV signal the original machines generated into a VGA compliant signal. Disabling this component makes cores supporting this to output a signal similar to the one delivered by the original machine.
Cores know to support this option are:
Some cores come with their own method of enabling 15khz/TV support. This is e.g. true for the PC-Engine and MSX cores which allow to enable TV mode via an OSD option (so you need to connect a VGA screen first to be able to use the OSD and change mode). Or simply by using a certain core version as the Atari XL and Atari 5200 cores do.