it looks like a mac floppy drive to the outside world, that's the interface, it emulates a BIG floppy :) At 03:45 PM 6/24/03 -0500, you wrote: >All, > a friend of mine had a question this group is probably best to > answer: > >------------- >I am trying to determine the type of interface on an old Rodime 552 >drive. It has 26 pins. SCSI has 50. IDE has 40. The old MFM used >two cables, not one so I don't think it's MFM. I did find a listing for >it at one of the surplus places in a table which lists interfaces, but all >it said was "26 pin". I'm trying to figure out if the thing is >actually one of the more common interfaces with a funny connector--perhaps >all the GND pins have been combined into one reducing the pin count. > >This model of drive is found in the old Apple Hard Disk 20, which was the >ancient floppy drive interface external hard drive used on Mac 128Ks and >512Ks before the Plus with SCSI came out. >---------------- > > any help for him? Thanks in advance, > - Mark