Here's the definitive answer, from another Lombard owner (me) who has researched it thoroughly.
The 400MHz Lombard has a hardware DVD decoder chip on the motherboard. The 333MHz Lombard does not.
The DVD decoder is supported in OS 9, but not in OSX. I believe the same is true for the PCMCIA DVD decoder.
Neither CPU is really fast enough for software DVD decoding without one or other of the hardware solutions.
Thus your choice are: find a motherboard from a 400 and swap it in, or find the DVD decoder PCMCIA card. In my opinion, the 400 motherboard is easier to find, but obviously more work to fit. Yes, it will work with your existing RAM and 333MHz CPU module (at 333MHz)
The 400MHz Lombard has a hardware DVD decoder chip on the motherboard. The 333MHz Lombard does not.
The DVD decoder is supported in OS 9, but not in OSX. I believe the same is true for the PCMCIA DVD decoder.
Neither CPU is really fast enough for software DVD decoding without one or other of the hardware solutions.
Thus your choice are: find a motherboard from a 400 and swap it in, or find the DVD decoder PCMCIA card. In my opinion, the 400 motherboard is easier to find, but obviously more work to fit. Yes, it will work with your existing RAM and 333MHz CPU module (at 333MHz)