Most board revisions of the original GBA are fairly minor, as the AGB-CPU-01 through AGB-CPU-04 only have slight layout changes which do not impact functionality or modifications. The two earliest revisions, the CPU-01 and CPU-02, tend to have the original version of the CPU while later boards have the "A" revision CPU.However, Nintendo skipped ahead from the CPU-04 to the AGB-CPU-10 in 2002, which has a different LCD interface compared to all previous revisions. This revision has a 32-pin LCD connector, whereas the CPU-01 through CPU-04 have a 40-pin connector.If you think my price is a crazy check online they are actually a decent price to this sort of motherboard.