I am in possession of a working 1986 Compaq Portable II. However, I couldn't find a 5.25" floppy with the proper version of DOS on it to actually make the computer, ya know, work.
I've since bought a Gotek USB floppy emulator, taken out the old 5.25" floppy drive, and replaced it.
Those who don't know what that is can view the following link:
I've also obtained a IDE power to Molex 4-pin power cable, and connected the hard drive to the emulator. So far so good. That's power taken care of.
However, when I went to connect the ribbon to the two drives, I was disheartened to see that the amount of pins between the two drives were different. One pin was filled on the hard drive's end making (if I remember correctly) 39 pins for the hard drive and somewhere around 34 pins for the emulator.
My question is this: does an adapter or cable exist for a 3.5 inch floppy to 5.25 hard drive connection, or am I going to have to attempt to solder a cable that can actually make this connection work? I can't find such a cable anywhere online.