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Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
Originally designed around the 16-bit 286 microprocessor and called the AT bus, the ISA bus has 24 address and 16 data lines, sufficient to handle 16 megabyte memory I/O addresses. The ISA bus is limited to a slow 8 MHz clock speed and for this reason, faster peripherals and memory left the ISA bus behind soon after its development. Unlike the earlier 8-bit PC/XT bus, the ISA bus includes two connectors. In addition to the single, 62-pin, 8-bit PC/XT bus connector, the ISA bus includes a second connector with four additional address and eight additional data lines, interrupt, and DMA control lines. Although IBM documented every pin on the ISA bus, they never published strict timing specifications to signals on the bus. As a result, ISA bus system developers designing products for many platforms had to guess at timing.
Problems developed as a result of holding the ISA bus to 8 MHz for backward compatibility. Some anxious manufacturers pushed the system speed causing products with marginal operations characteristics, especially when extra memory was added to high-speed PCs. Since the IEEE ISA standard of 1987, the bus signals have remained unchanged. In 1993, Intel and Microsoft announced a joint development, Plug and Play ISA, a method for making expansion boards work with the ISA bus, eliminating the need for DIP switch settings, jumpers, interrupts, DMA channels, ports, and ROM ranges. The Plug and Play card tells the host computer what resources it requires. This requires a large software-based isolation protocol which keeps an expansion board switched off until it can be addressed, allowing one card to be polled at a time because slot-specific-address enable signals for expansion cards are not part of the ISA specification. In 1987, the ISA bus made way for the IBM PS/2 “clone-killer” computer “Micro Channel” bus however, the clone makers initially ignored the PS/2 and Micro Channel.
Industry:Software
A mike designed to be fed into an amplifier or transformer with input impedance of 150 to 250 ohms.
Industry:Software
a) A list of calculations that you can apply to materials as part of the rendering tree language. The node can, in turn, serve as input to other nodes. b) Any signal line connected to two or more circuit elements. All logic inputs and outputs electrically connected together are part of the same node.
Industry:Software
A rotating guide attached to a heavy flywheel to reduce the effect of varying supply reel friction on tape speed.
Industry:Software
A variation in amplitude level that occurs as a function of frequencies below 1 MHz.
Industry:Software
Clusters of materials, i.e., a large nodule of iron oxide on magnetic tape would be a tape defect.
Industry:Software
A mismatched edit that creates a visual disturbance when replayed. Usually occurs when cutting between two images which share an identical subject but place the subject at different positions in the frame.
Industry:Software
