Re: Commodore datassette for the Oric-1

From: Marko Mäkelä (Marko.Makela_at_HUT.FI)
Date: 2002-04-08 08:33:44

  • Next message: Richard Atkinson: "Re: Commodore datassette for the Oric-1"
    On Sun, 7 Apr 2002, Richard Atkinson wrote:
    > The "hardware modification" you speak of can be done entirely externally -
    > it's just a lead going between the monitor connector (and SYNC pin
    > thereof) to the cassette connector (IIRC). And the VIA's own timers can
    > then be used once synchronisation is achieved.
    Yes, similar to the raster interrupts on the VIC-20.  You only need to
    read the raster beam's position in order to determine when to start the
    timer.  I wonder if the position could be determined by reading open
    address space (like $de00-$dfff on a C64).  I wonder if the same could be
    done on the ZX Spectrum.  That'd probably break all Spectrum emulators. :-)
    > I haven't got a reference handy of which lines (if any) the cassette
    > shares with the PSG, but it sounds like simple power supply noise
    > issues to me.
    Or adjacent signal lines interfering each other.  I remember that the
    Soundblaster card installed to a 286 PC of my friend made quite some noise
    when the hard disk was accessed.
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