Well, another night.. another failure
I did end up buying both the iMicro ($99) and the 300 Gold ($200) from AverKey. Both of them seem to work well when outputting to a TV (composite) but I cannot get it to work with RGB out to the JPAC.
A brief email from Andy over at ultimarc tells me to remove the Cypress CY7C63231. Then I used the VGA cable that came with my JPAC and plugged into the 15-pins DSUB on the converter's RGB out. Nothin
and JPAC doesn't even register sync (no lights) but I suspect that's because the cypress chip was pulled.
So my theory is maybe the RGB out on the Averkey boxes are not the same as the DB-15 JPAC was expecting? is this possible? I've sent an email to averkey to see if I can get their RGB pinout.
Last resort is to hack a VGA cable and try other 15 pins RGB pinouts I found online to see if it'll talk to the JPAC or my arcade monitor directly.
and very very last resort, return both scan converters to compusa and buy another Vidcard and more test.
*sigh*