OK, so I'm back to answer my own question. Hopefully it will help some other Pin2K newbie. The conversion kit that I bought only had the daughter ROM card, not a complete prism card. The daughter card contains graphic and sound data, but the game code itself is stored on the other half of the prism card. I powered up after doing a direct daughter card and playfield swap, so my game saw the SWE1 game code as corrupt game code and defaulted to the barebones game code encoded on the daughter card (RFM V0.8). So, what do I do from here? Well, the main problem with playing this way is that there is no sound. Although there is sound code on the sound ROMs on the daughter card, there is also sound code on the game code side. Since I have SWE1 gamecode, the complete sound "ROM" is "corrupt" and the result is a failed sound ROM checksum and no sound. The solution will be to update the SWE1 gamecode to RFM gamecode using a Windows 98 PC. Unfortunately, when I change playfields and daughter cards back to SWE1, I will have to reprogram the gamecode with the Windows 98 PC every time I want to swap.