Hi Guys, I was recently given a Mac 512k which I'm told had been stored in a lockup for a number of years. No original box or software floppies, but do have the original keyboard and mouse. First thing I noted was that the battery had been left in the compartment - and leaked! On removing it, one of the battery terminal lugs fell apart due to corrosion. (Photo 2 attached). I've now removed both the logic and power board, both of which fortunately appear to be free from any battery spillage or contamination. Unfortunately the same can't be said for the metallic frame which the power board attaches to, as this has suffered from acid spillage and corrosion - most of which can probably be removed with the use of a wire brush. (Photos 3 & 4 attached). I have also removed and disassembled the floppy drive, the disk-carriage mechanism of which had completely seized up. Nylon gears looked ok, and after a thorough cleaning and re-application of grease, gears & mechanism appear to now operate smoothly by hand. The floppy drive is a Sony, model OA-D34V-22 which I understand to be a 400k. Regarding this drive, I note that on the motherboard the ROMs are marked: "ROM-LO" "342-0221-A" "ROM-HI" "342-0220-A" - My 1st query: Is this floppy model OA-D34V-22 (400k) compatible with the 'A' suffix ROMs? Reading MacTec68's excellent info provided in a previous thread (July 22/2015 #2), he advises that, "Earlier "-A" ROMs are only compatible with the "OA-D34V" drive." This would seem to suggest that floppy and ROM's on this Mac are incompatible. True? -My 2nd query: The damaged battery holder is a Capetronic, model DS 1011. (Photo 1 attached). I can find no on-line reference to this part number. Any idea on where I can find an identical replacement, or a similar battery holder to suit? -My 3rd query: After brush clean-up of the power-board metallic frame, what is the best way to further protect the surface prior to refitment? Would greatly appreciate any comments on the above. Cheers for now.