I'm just working on doing a new board layout for the G1 adapters, so it will then fit in the DC case properly etc.
There were also some problems with soldering, because the clearance between the solder mask and the pins was way too short.
I'll get some new boards made, then update the forum with a short user guide for them when they're ready.
btw, an easier way to connect something to the G2 ("modem") port might be to connect to the custom Sega chip in an original modem...
I traced the pins from the Sega chip to the Modem chip a while ago, and it helps handle the address decoding for you.
Only an 8-bit bus though...
RP336LD SEGA 315-6137
D0 144. 45.
D1 1. 44.
D2 3. 43.
D3 4. 42.
D4 6. 41.
D5 8. 40.
D6 9. 36.
D7 10. 35.
RS0 11. 34.
RS1 12. 33.
RS2 64. 5.
RS3 65. 4.
RS4 66. 3.
/CS 67. 1.
/WR 68. 47.
/RD 69. 48.
I got the inspiration from somebody's YouTube vid....
http://www.youtube.com/watch?v=700hQyUWurc
OzOnE.