METROGAMING88: Vacuum-tube Based Computers had Modular Construction

METROGAMING88 Physically, ATA is essentially a simple subset of ISA, with 16 data bits, support for exactly one IRQ and one DMA channel, and 3 address bits. The second connector adds four additional address lines for a total of 24, and 8 additional data lines for a total of 16. It also adds new interrupt lines connected to a second 8259 PIC (connected to one of the lines of the first) and 4 × 16-bit DMA channels, as well as control lines to select 8- or 16-bit transfers. The ISA slot connector is typically black (distinguishing it from the brown EISA connectors and white PCI connectors). As explained in the History section, ISA was the basis for development of the ATA interface, used for ATA (a.k.a. Before the 16-bit ATA/IDE interface, there was an 8-bit XT-IDE (also known as XTA) interface for hard disks.|Lorong Waktu 3