So I took the time to look at all my cartridges now. So far all have the same PCB serial, 020309E4-01-1. Other data in the following table.
| ROM (TAMA7) | MCU (TAMA6) | Interface (TAMA5) |
|---|---|---|
| B9748 43903A | 9752H | 9749 EAH1 |
| B9748 43906A | 9730H | 9726 EAA1 |
| C9749 43896B | 9731H | 9725 EAD1 |
| J9748 43860A | 9728H | 9726 EAB1 |
| C9749 43908A | 9727H | 9725 EAI1 |
| B9748 43906A | 9730H | 9726 EAA1 |
Somewhat disappointing: all contain the same ROM. I had hoped that some of the letters would indicate a ROM revision, but alas, seems to be a date code, or manufacturer code etc.
