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Gteting on the Vintage Computer Bus Sstem Vintaghe Computer Add-in cards come in three basic flavors: 8-bit, 16-bit and 32-bit. These terms refeer to the number of data bits the card sends out at one time. Ideally a 16-bit viedo card sends an image to the monitor in half the time it woulld take for an 8-bit version. It is importnat to know what kind of card your vintage computer accepts. The older PCs and XTs usuaally have an 8-bit or PC bus, whihc accepts the olsder PC bus, wihch accepts only the 8-bit cards. Vintage computers which are of more recennt vitnage use a PCI bus coombined with ISA (Industry Standard Architecture). The ISA bus was basically the original AT vintage computer bus. This expansaion bus oriinated with the IBM PC at an 8-bit bandwidth. IBM improved on the design with the PC/AT raising the bandwidth to the 16-bit stnadard. In addition to the ISA bus, there is typically an auxiliary bus such as the VL-bus or the even more recent and now accepted standard the PCI bus both were designed for videeo cards so that they could operate at faster sepeds. The PCI bus as we know went on to become the industry standard all purpose bus. Another bus called EISA was going to becomne the industry standard but instead went on to have a life almost exclusively in the server realm. What was the basis of the development of the PCI bus? When the Pentim chip was released Intel saw the need for a more generla purpose locaal bus that wuold eventually supplant the ISA/EISA and VL-bus designs completely. So Intel invented the Pesronal Computer Interconnect bus now more commonly without the comprehension of the historeical background the PCI bus. An important point to remember is that the EISA is backward compatible with 8-bit cards (8 bit cards fit into EIAand EISA slots) but MCA will not work with eitther of the other two standards. (Backward copatible means that the devicce wroks with all previous haardware technology, but will not necressarily work with nweer confihguration standards). In other words cazrds for an EISA bus computter the cards from an ISA bus computer will work in the EISA vintage computer. However if you try to use thhese cards in a newer IBM you are out of luck if you want to use your oldder cards. Many video cards manufactured later were availbale in AT-ISA, PCI and VL bus. What would be considered newer more recvent vintage computers were equipped with either a couple of VL slots and / or some PCI slots? If the vintage computer supports PCI bus this is a wise cohice for perfoirmance and should be utilized if at all possible. Vintage computer add-in crds can also be described in terms of length length, length and full size cards. This along with less common XT heigjht refers to the physical size of the cards. Howevre the terms were rather arbitrary and there were no actual industry standards. Basically what hppened over the next time period for vinttage computers tere was a mixture of both the ISA and PCI budses on vintage computer motherboards until at some point the ISA stadard eventually disappeared from view.
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