Heya!
Since the combination of a PiStorm/RPi and a CDTV is probably a quite exotic one, I thought I'd tell a bit about my own experiences with this.
A few weeks ago, I installed the OS on my RPi, removed my 7 MHz 68K CPU from the CDTV and plugged in the PiStorm.
The configuration did present me with a few challenges, but a few site visits and questions later, the very kind and helpful people there had provided me with the answers needed... so in case any of you should decide on this upgrade, here's what should be done in order to make it work:
-J15 (CDTV functions) has to be removed as of this moment. There should be a new CPLD firmware underway, which fully support the CDTV, but until then we need to remove that jumper.
- The main CPLD firmware edition WON'T work with the CDTV; the experimental one is needed.
- The config setting "physical-z2-first" should be used. It may be unnecessary, but I couldn't make mine work without, however.
Now, for the fun part:
- My CPU speed according to SysInfo is higher than the A4000/25 shown.
- I now have 256 MB Z3 Fast RAM on my CDTV (!)
- My SD card hdf files' transfer rates are around 22-23 MB/sec; about 10 times faster than I had with my SCSI adapter.
- I also have hi res graphics with RTG, AHI should soon be available, too, USB port, wi-fi, and bluetooth.
- Kickstart and extended ROM's can be loaded from an image file; thus, a kickstart switch is now merely a matter of editing the config file and then reboot. And there's no need to replace the physical chips anymore.
When the new CPLD firmware (hopefully soon) is available, along with the soon-to-come extended ROM 2.35, all CDTV specific functions should be available once more.
All in all, combined with the very acceptable price for a RPi and a PiStorm, this is definitely an upgrade I can recommend!