💰 What is the little twist in this floppy ribbon cable for? - Super User

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Gigabyte GAM59SLI-S5 MOBO There is a connector on this mobo listed as FDD, can anyone tell what this is for? 8O.


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Find here online price details of companies selling FDD Cables. Get info of suppliers, manufacturers, exporters, traders of FDD Cables for buying in India.


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A floppy-disk controller (FDC) is a special-purpose chip and associated disk controller circuitry that directs and controls reading from and writing to a computer's floppy disk drive (FDD). via an Industry Standard Architecture (ISA) bus or similar bus and communicates with the Floppy Disk drive with a 34 pin ribbon cable.


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rating.pterophyllum.ru: floppy drive cable.


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FDD data cables use a standard pin pinout (see Table ), but But a standard two-drive FDD cable has wires 10 through 16 twisted between the first.


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Cable World® " USB External Floppy Disk Drive Portable MB FDD PC Windows /XP/Vista/7/8/10 Mac,No Extra Driver Required,Plug Play,Black.


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Cable World® " USB External Floppy Disk Drive Portable MB FDD PC Windows /XP/Vista/7/8/10 Mac,No Extra Driver Required,Plug Play,Black.


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A floppy-disk controller (FDC) is a special-purpose chip and associated disk controller circuitry that directs and controls reading from and writing to a computer's floppy disk drive (FDD). via an Industry Standard Architecture (ISA) bus or similar bus and communicates with the Floppy Disk drive with a 34 pin ribbon cable.


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Gigabyte GAM59SLI-S5 MOBO There is a connector on this mobo listed as FDD, can anyone tell what this is for? 8O.


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Why the developers who use Rust love it so much. Certain non-PC-compatible systems like the Radio Shack Color Computer did actually use floppies without the cable twist, but required manually setting the jumpers, and could indeed use four drives at once. To avoid this, we should setup them by jumpers or by hard-wiring their role so there would be a drive set to be drive A that would listen to signals on the select A wire, while the other drive would be drive B that would listen to signals in select B. The cable twist allows both floppy drives to be configured identically for drive selection when installed for manufacturing convenience , yet operationally, can be uniquely selected as either the first drive or the second drive based on cable position. What is the purpose of it? Without the twist, we have to configure the drives and set them to be drive A for one and B for the other, because when the motherboard selects for example drive A, both drives would receive the select signal if they are both configured as a drive A. The original spec IBM worked from the drive mfg's standard had two cables allowing 4 drives. There is a twist of a few lines in this floppy cable. While hard-wired drives are usually a drive B, there is the chance to be a drive A as said by Tonny here :. What the twist does it to change the connection of the drive on the far end of the twist so that it is different than the drive before the twist. Later systems could order drives in the BIOS and had no need to "sequence" floppy access. With hobbs 's words here :. The rest of the pins read and write data, stepper motor control, head select, etc. Viewed 27k times. PATA has a 40 pin connector, while floppy has a 34 pin connector. Their cheap power supplies couldn't handle more than one drive at a time so the hack was done. Sign up to join this community. Let's say both drives are hard-wired to be drive B. A picture is worth a thousand words! Summarizing everything tl;dr The drive before the twist will be drive B while the one on the end will be A. This is done to cause the drive at the end of the cable to appear as A: to the system and the one in the middle to be as B:. This is totally doable, but we don't want to mess with the setting of the drives, just want to throw them into the PC case and plug in the cables. I'm also unclear how a cable cut would prevent both motors from being enabled simultaneously; that would seem like either a hardware restriction on the controller card or a software restriction in the BIOS. I'm pretty certain that programs that did a lot of access to both floppies in near proximity could leave both drives running. There are some cables that do not have the twist, and it is these that are actually non-standard! While it would have been possible to use jumpers on each drive to indicate whether it should respond to the first or second set of wires, standard practice has been to have all drives configured to respond to the drive-select and motor-start wires associated with drive B:, but then have a cable twisted between the two drive connectors so that the drive attached to the far-end connector will see the drive B: select wire when the controller is activating the drive A: wire. Aragorn Aragorn 1, 1 1 gold badge 13 13 silver badges 12 12 bronze badges. IBM made the kludge to allow floppy drives in mainframes to be changed without need for jumpers. Despite the fact that this appears to be a "hack" well, it really is a hack , this is in fact the correct construction of a standard floppy interface cable. You will also notice that there is an odd "twist" in the floppy cable, located between the two pairs of connectors intended for the floppy drives. Email Required, but never shown. A drive has to ignore all input and produce no output when it's not selected. Super User works best with JavaScript enabled.{/INSERTKEYS}{/PARAGRAPH} We're switching to CommonMark. You can tell apart quite easily by looking at them Yes, after a few searches I found it out, but until now I never realized that this happens only at floppy cables. They can be configured identically and the twist will swap the controlling input for them. {PARAGRAPH}{INSERTKEYS}Super User is a question and answer site for computer enthusiasts and power users. Related 5. A drive has to ignore all input and produce no output when it's not selected While hard-wired drives are usually a drive B, there is the chance to be a drive A as said by Tonny here : I once had a whole afternoon of entertainment trying to figure out why a drive which came from a working system wouldn't work in another computer Also, please note what Michael Hampton wrote here : Certain non-PC-compatible systems like the Radio Shack Color Computer did actually use floppies without the cable twist, but required manually setting the jumpers, and could indeed use four drives at once. Also, please note what Michael Hampton wrote here :. Now we don't have to setup them, but they both listened to the select B signal, while the motherboard would still want to send a signal to select A to select drive A. The best answers are voted up and rise to the top. That old machine's seen quite a few upgrades, including a W PSU, 3. Sign up using Facebook. Or quoting sawdust , from this comment :. Pins and cabling The twisted pins are from pin 10 to pin Explanation Without the twist, we have to configure the drives and set them to be drive A for one and B for the other, because when the motherboard selects for example drive A, both drives would receive the select signal if they are both configured as a drive A. Or quoting sawdust , from this comment : The cable twist allows both floppy drives to be configured identically for drive selection when installed for manufacturing convenience , yet operationally, can be uniquely selected as either the first drive or the second drive based on cable position. The Overflow Blog. They're both hard-wired drive Bs that listen to their select B pin, but for one drive we connected the select A pin to its select B so the motherboard can control it through the select A bus. You're just making stuff up. Featured on Meta. The drive before the twist will be drive B while the one on the end will be A. The cable lunacy carried over to the PC market and became a defacto standard. It only takes a minute to sign up. Still remember working with these. Hot Network Questions. What posts should be escalated to staff using [status-review], and how do I…. Here comes the twist! Question feed. Post as a guest Name. Ask Question. God, I feel old. Pang 1 1 gold badge 9 9 silver badges 12 12 bronze badges. This way, there is no need to "configure" the drives which drive A or B are they going to be and what they should listen to. I once had a whole afternoon of entertainment trying to figure out why a drive which came from a working system wouldn't work in another computer It turned out to be hardwired for A and the original computer used a normal cable, but had the signals twisted on the motherboard itself! Home Questions Tags Users Unanswered. While it might seem a little backward to have the drives respond to the drive B: wires in the absence of a twist, doing things that way makes it possible to use the full length of the cable when connecting a single drive A:, without requiring that the cable be twisted both before and after the middle connector. The drives themselves can have a switch or jumper that allows the drive to operate as either drive A or as drive B. Sign up using Email and Password. While this hack allows for the end user to not have to mess with jumpers, it also restricts the system to two floppy drives. There is also a little cut in most cables to prevent more than one drive from running at the same time - reducing the motor select signals available on the cable. At least usually Thanks Olivetti, for wasting half a day of my life. What is the little twist in this floppy ribbon cable for? Podcast New tools for new times. All are outputs on the floppy controller and inputs on the drives. After the first drive, we twist the select cables so the drive A that is still a hard-wired drive B will listen to the select A controls, because we connected the select A pin to its select B pin the only pin it listens to. Active Oldest Votes. Active 10 months ago. Managed to pull the data off a really old 2. Now the drive before the twist will work as a drive B listening to select B signals, while the drive after the twist will work as drive A listening to select A signals. Additionally, one wire is activated when the drive A: motor should turn on, while the other does likewise for drive B: obviously when code is going to want to access drive A: it's going to turn on the motor, but having separate motor-control wires will mean that code which wants to access drive A: now but will be wanting to access drive B: again can turn on both motors. Asked 5 years, 6 months ago. On the PC floppy-drive cable, one of the wires is activated when a request is made to access drive A:, and another is activated when a request is made to access drive B:. Sign up or log in Sign up using Google.