ISA

IBM AT (advanced technology) computer expansion bus design, the full name is Industry Standard Architecture, this design uses 16-bit bus, there are several 8-bit slots for backward compatibility. The AT bus has increased the data bus bandwidth and the address bus has been increased to 24 lines, enough to address 16 MB of memory. Backward compatibility is guaranteed by adding an additional connector to the original 8-position 62-pin connector. Several new interrupt request IRQ lines and direct memory access (DMA) control lines have also been added.