![]() ![]() All others infinity.įrom the measurements. I tested impedance on the front and back USB Type A ports (receptacles) and got 1.2 Ohms on pin 4 (which can maybe match pin 3 top right on the header). These are resistance and voltage readings I took as per recommendations:Īs for other components/devices nearby, this is it (bottom right SAS backplane cable removed for clarity): So this is basically a hands-on job, hopefully without toasting anything. I searched all over the place for IBM-related pinout information to no avail. Now the problem is, how do I determine the header pinout (using a multimeter, etc.) without frying the motherboard, port or any device attached to it? I already got the parts (the RDX, a USB Type B cable and a Dupont style 2x3 connector). The IBM cable is either unobtainable or the price is insane, so I decided to just make one myself. These are for connection to a single device (either an LTO drive, an RDX drive, etc.). I have two IBM Power 7 machines - Power720 and Power740 (8202-E4B and 8205-E6B) and both have an internal USB 6 pin header (labelled J3_TAPEUSB_SIGNAL).
0 Comments
Leave a Reply. |