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/* Technical information */
=Technical information=
You can use the &F888/&F988 audio ports and the CRTC cursor registers to program the raster interruption located at &0066. Both work on PlayCity and Play2CPC.
These audio ports are not sufficient to access the full potential of the OPN3 soundchip. Another i/o address (unknown) is necessary.
The OPN3 soundchip is mostly a light version of the OPNA soundchip with some functionalities removed: no external ADPCM, no Composite Sine Mode and no GPIO.
