ZIATOGEL RTP SLOT Industry Standard Architecture (ISA) is the 16-bit internal bus of IBM PC/AT and similar computers based on the Intel 80286 and its immediate successors during the 1980s. The bus was (largely) backward compatible with the 8-bit bus of the 8088-based IBM PC, including the IBM PC/XT as well as IBM PC compatibles. An attempt to extend it to 32 bits, called Extended Industry Standard Architecture (EISA), was not very successful, however. In 1988, the 32-bit EISA standard was proposed by the "Gang of Nine" group of PC-compatible manufacturers that included Compaq. However, MCA was also a closed standard whereas IBM had released full specifications and circuit schematics for ISA. MCA was far more advanced than ISA and had many features that would later appear in PCI.|The Number One Article on Slot Live