Slots are parts of a computer system that are very common and are always available. One of them is expansion slot, this slot is used to facilitate communication between input / output equipment with the motherboard, such as for VGA Card, Sound Card, Modem, and others. Expansion slots have various specifications, but the difference between one and the other is the shape, speed of data processing, and the facilities it has. And every slot available on the motherboard will affect the price and performance of the system itself
These are known slot types in computer systems:
1. ISA (Industrial Standard Architecture).
This slot is the most commonly available on the motherboard, because the ISA is the slot of the motherboard. The longest slot is ISA. But if all the slots are the same bet, it’s a sign that the slot on the motherboard is all-bit ISA. ISA has a transfer rate of 0.625MB / sec. While the system that is widely used today uses 16-bit ISA which has a transfer rate of 2MB / sec. This is not a big amount. But the card that has an average speed is no more than this, so this slot is considered still quite compatible. ISAA for soundcard slots.
2. EISA (Enhanced Industry Standard Architecture).
EISA is more in the system server. Because this gap is deliberately intended to handle work that is heavier than ISA. EISA has bus mastering features that can work freely without overloading CPU work. Examples of cards that use this slot are SCSI cards. Since this slot does not work with the CPU, this slot is quite appropriate to be used to increase the speed of work of the computer.
3. MCA (Micro Channel Architecture).
This slot was first introduced by IBM. Like EISA, MCA has 32-bits and is able to do maternal buses too. However, MCAs have limitations. If on EISA you can install an ISA card, the MCA ISA card cannot be installed inside. However, MCA can automatically send a card that is installed and immediately performs basic configuration. MCAs are also stronger and errors that sometimes occur in other slots. Unfortunately, this gap has become history, which is not used anymore.
4. VESA (Video Electronics Standard Association).
As the name implies, this slot is done for graphic purposes that require high speed, such as a video card. The transfer rate owned by VESA itself is 132MB / sec. Basically the same as the ISA slot, but VESA has an additional slot behind which the total length of the VESA is 4 inches larger than the ISA slot.
5. PCMCIA (Personal Computer Memory Card International Association).
What is very striking from this slot is the form of the card that will be inserted into it, which is only a credit card. Usually the slot is only available on devices that have high mobility, such as notebooks. However, now there are also many PCs that provide PCMCIA slots. Using the 68 pin interface, this slot serves as an additional feature of a system. PCMCIA is available in various types according to its thickness. Type 1 has a thickness of 3.3 mm and usually functions as RAM or flash memory. This type is most often available on PDAs or digital cameras. Type 2 has a thickness of 5 mm and usually works as a modem or adapter. Type 3 is the lowest type (10.5 mm). It usually works as an additional tool such as a hard drive.
Usually if you have a PCMCIA type 3 slot, you can also use devices that use type 1 and 2, because of their thickness. Each slot requires a communication path to connect the card to the CPU. This communication path consists of IRQ, DMA, and memory addresses.
6. PCI (Peripheral Component Interconnect).
PCI developed by Intel. Therefore, this slot is very commonly available on motherboards that use Intel processors. PCI’s speed is almost the same as VESA, but other specifications are different. In PCI, it won’t be bothered with configuration problems. Because PCI can configure automatically. Depending on the advantages of this PCI, the Plug and Play concept was introduced. PCI slots function as a place / slot for modems, tv tuners, LAN cards or Multi-functions.