Here are the definitive steps to get a Gotek floppy emulator working in an IBM P75. These instructions will work in a P70 too most likely, and also most later model IBMs I would assume.
You will need:
- Gotek Floppy Emulator
- Spare wire (3 inches)
- Soldering Iron, Solder (and flux! You can’t have enough flux!)
- 34 pin standard floppy cable (no twist is used in the P75 / P70)
- USB flash thumb drives
- 5 pcs 1K resistors (you can use anything from 1-10K, but I used 1K).
Step 1) with some small cutting plyers, cut off pins 4, 6, and 3. (OR you could cut the cable for the same pins)
Step 2) trim resistor legs on one side by ½ and then solder to pins 8, 26, 28, 30, 34.
Step 3) tie unsoldered legs of resistor together and also tie in one end of wire
Step 4) solder other end of wire to 5V pin (red wire from power supply)
Step 5) arrange jumpers on Gotek as in video below
Step 6 OPTIONAL) for older IBMs you must also ground pin #4 (expose the wire in the cable and solder a wire to it and one of the black pins on the power supply cable)