- #SIGNTRONIX SOFTWARE LED 2 INSTALL#
- #SIGNTRONIX SOFTWARE LED 2 FREE#
- #SIGNTRONIX SOFTWARE LED 2 WINDOWS#
This could have disastrous consequences for the data on the hard disks, and it would most likely cause the computer to crash. Flip-flop IC1a is included here to prevent the hard disks from swapping roles during use. If S1 is open when the reset pulse occurs, the above situation is of course reversed, and the hard disk attached to connector K2 will act as the D: drive, while the hard disk attached to connector K3 will act as the C: drive. For this disk, this indicates that it is to act as a slave drive (D: drive). This will prevent T3 and T4 from conducting, with the consequence that LED D2 will be extinguished and the hard disk attached to connector K3 will see a high level on its CS pin. A high level will appear on the Q output following the reset pulse. The hard disk attached to connector K2 will thus see a low level on its CS pin, which will cause it to act as the master drive and thus appear to the computer as the C: drive. The current flowing through T1 will cause LED D1 to light up and transistor T2 to conduct. This low level on the Q output will cause transistor T1 to conduct. If we assume that the switch is closed during start-up, a low level will be present on D input of IC1a, so the Q output will be low following the reset pulse. The state on the Q output is naturally always the opposite of that on the Q output. This pulse clocks flip-flop IC1a, and depending on the state of switch S1, the Q output will go either high or low. When the computer is switched on or reset, a pulse will appear on the RESET line of the IDE interface. An IDE hard disk is connected to K2, and a second one is connected to K3. Most of the signals are fed directly from K1 to the other connectors (K2 and K3).
The circuit shown here is connected to the IDE bus of the motherboard via connector K1.
This causes a low level to be present on the CS pin of one of the drives and a high level to be present on the CS pin of the other one (at the far end of the cable). For this reason, in every IDE cable one lead is interrupted between the connectors for the two disk drives, or the relevant pin is omitted from the connector. In the latter case, a signal on the IDE cable tells the hard disk whether it is to act as the master or slave device. Every IDE hard disk can be configured to use either Master/Slave or CableSelect. This trick is made possible by a feature of the IDE specification called ‘CableSelect’. From the perspective of the computer (and the software running on the computer), it appears as though these two hard disks have actually changed places. It is a hardware solution that causes the primary and secondary hard disk drives to ‘swap places’ when the computer is started up, if so desired. The solution presented here does not suffer from this problem. In many cases, the only remedy is to reinstall the software. Unfortunately, this does not always work flawlessly, and in most cases this boot manager is replaced by the standard boot loader of the operating system when a new operating system is installed. A program called a ‘boot manager’ can be used to allow the user to choose, during the start-up process, which hard disk will be used for starting up the computer. A software solution is often used for such a ‘dual system’.
#SIGNTRONIX SOFTWARE LED 2 INSTALL#
Switching from one operating system to another – that’s a risky business, isn’t it? Although this may be a bit of an exaggeration, the safest approach is still to install two different operating systems on the same PC, so you can always easily use the ‘old’ operating system if the new one fails to meet your needs (or suit your taste). In other words, it’s difficult to make a good choice. One problem is that not all hardware works equally well under the various operating systems, and with regard to software, compatibility is far from being universal. Computer users thus have a large variety of options with regard to the operating system to be used.
#SIGNTRONIX SOFTWARE LED 2 WINDOWS#
Windows is also no longer simply Windows, because there are now several different versions (Windows 95, 98, ME, NT, XP, Vista and 7). These systems are also available in different colours and flavours (versions and distributions).
#SIGNTRONIX SOFTWARE LED 2 FREE#
Various free (!) operating systems have been added to the list, such as BeOS, OpenBSD and Linux. In the last few years, the available range of operating systems for PCs has increased dramatically.
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