=Technical information=
* Port &F988: read status 0 or select a page 0 register(for SSG, digidrums and the first 3 FM chans)* Port &F984: read status 1 or select a page 1 register(for the last 3 FM chans)
* Port &F888: read/write to the selected register
The SSG, the digidrums and the first 3 FM chans are accessed on register page 0. The last 3 FM chans are accessed on register page 1.
You can also use the CRTC cursor registers to program the raster interruption located at &0066.