Well, technically speaking you can go digital if you want to totally rip out the analogue front-end of a TiVo and direct inject the MPEG video stream from a PAL DVB-T tuner front-end. To do this you will need to remove and redesign most of the circuitry from the input sockets right up to the TiVo ASIC media switch.... oh then of course write all the necessary software.
And then don't forget to get 5.1 output you will need to totally redesign the audio section from the hard disk right through to the output chips... and then of course write all the necessary software for that too.
Are you up for the challenge? And then if you are are you prepared to redesign pretty much all of the internal circuits for each and every person who wants one done... I'm not!
And yes you are right. S2 is not a reality because there is no information available on the register sets of both the Broadcom BCM7020 and BCM7040 chips. Of course this is for a S2 that also has analogue inputs and outputs in 2-channel audio too. If you want to have something like you are wanting then this is something all together different again.
So sorry to rain on your parade, but it is not going to happen. Unless you know something I don't and then feel free to share as afterall this is a community hobby based device that requires and welcomes input.
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