Alright! Just got my PMD back to life. I ordered a ZIF > CF adaptor and after a little rooting around getting it in the right way it is working.
I got it from a place called DX - this is the exact item I ordered:
http://www.dx.com/p/cf-zif-convertor-ci ... bles-11814
Bits like this dont usually have brand names, so if that item is removed try googling the model - PA-CF18Z. I specifically got this one because the reviewers said it worked in their ipods.
It comes with 2 ZIF cables - neither of them worked for me, I used the original. The new cables seemed a bit thicker which might be what the 2mm vs 3mm difference is, they didnt really fit into the PMD interface and the old cable didnt fit well into the adaptor interface, but it does have a good locking mechanism on it.
After it booted up it did it's 'hard drive needs to be restored' thing, then gave me an error about old firmware, PME also complained about FW. I had 16219 on it before the swap. The PMD did load up properly as a mass storage device so I just put the 16219 file into the .Pacemaker dir and restarted it. It loaded the FW and started working.
2 issues since then - the first time I opened the track browser it froze, after a restart it was OK for 5-10m then the crossfader froze. I'll try loading the latest beta tomorrow and see what happens.
Good luck anyone else trying this. If I get it working it will certainly have been worthwhile.