![]() ![]() After IBM introduced the "twist" to floppy cables, and when both 5.25-inch and 3.5-inch drives were in common use, many cables had four connectors: one of each type before the twist, and one of each type after the twist. Most controllers support two floppy drives, so a cable could have 5.25-inch style connectors, 3.5-inch style connectors, or a combination. Signal and control interface ģ.5-inch and 5.25-inch drives connect to the floppy controller using a 34-conductor flat ribbon cable for signal and control a separate cable provides d.c. A separate connector is provided for DC power. If there are four drive connectors at least two must remain unused. Only two drives may be connected to such a cable. This allows two drives connected to the same cable to be addressed by the host controller. The cable is normally formed into a ribbon, and a twist located between the pairs of connectors for the drives (see image) is usually applied to the conductors for pins 10 to 16 inclusive. A 'universal' cable would have four drive connectors, two for each size of FDD, although cables which have only two drive connectors are common. The de facto standard for 3.5 inch drives uses a dual in-line pin style connector mating to a socket connector, collectively slightly smaller than the PCB edge pin connector and mating socket used for the 5¼ inch standard but with the same 34 pin definitions as the 5¼ inch standard. ![]() ![]() The 34-pin connector is similar in pinout to the standard 50-pin connector for 8 inch FDDs. : 169 The signal interface uses a dual in-line 34-pin PCB edge connector which mates to a flat ribbon cable connector a separate connector is for DC power. The de facto standard 5.25 inch FDD interface is based upon the Shugart Associates SA400 FDD. 5.25 inch Connectors for 5.25 inch or 3.5 inch FDD (Drive "A") at end of universal two drive FDD cable. : 171 The signal interface uses a dual in-line 50-pin PCB edge connector which mates to a flat ribbon cable connector separate connectors are provided for both AC and DC power. The de facto standard 8 inch FDD interface is based upon the Shugart Associates models SA800/801 FDDs and models SA850/851 FDDs. For example, before adopting 3.5-inch FDD standards for interface, media and form factor there were drives and media proposed by Hitachi, Tabor, Sony, Tandon, Shugart and Canon. For the SASI see, see Shugart Associates System Interface.Įach generation of floppy disk drive (FDD) began with a variety of incompatible interfaces but soon evolved into one de facto standard interface for the generations of 8-inch FDDs, 5.25-inch FDDs and 3.5-inch FDDs. ![]()
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