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Apple Computer Custom IC Definitions

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  • CLUT/DAC (color look-up table and digital-to-analog converter) IC developed by Apple and used in the Macintosh Display Card4•8, 8•24, and 8•24GC
  • DFAC (Digitally Filtered Audio Chip), the sound input and filter IC first used in the Macintosh LC
  • SWIM (Super Woz Integrated Machine), the IC that supports the SuperDrive high-density floppy disk drive
  • JDB (Junction Data Bus), one of two ICs making up the I/O Adapter, connecting the data signals from the system bus and the I/O bus
  • Relayer, one of two ICs making up the I/O Adapter, controlling the bus buffers and providing bus arbitration logic
  • MCU (Memory Control Unit), a custom IC that connects to the system bus and controls regular and burst-mode data transfers to and from the main RAM and ROM
  • YANCC (Yet Another NuBus Controller Chip), a custom IC that controls the NuBus interface
  • DAFB (Direct Access Frame Buffer), an IC that connects directly to the system bus and controls the video RAM (frame buffer)
  • Enhanced ASC (Apple Sound Chip), a custom IC that replaces the Apple Sound Chip
  • Sporty, a custom IC that provides sound output amplification functions
  • PSX. The PSX IC functions as the bridge between the PowerPC 603e microprocessor and the PCI bus. It provides buffering and address translation from one bus to the other.
  • O’Hare. The O’Hare IC is based on the Grand Central IC present in the Power Macintosh 7500 computer. It is an I/O controller and DMA engine for Power Macintosh computers using the PCI bus architecture
  • AWACS. The audio waveform amplifier and converter (AWACS) is a custom IC that combines a waveform amplifier with a 16-bit digital sound encoder and decoder (codec).
  • CudaLite. The CudaLite IC is a custom version of the Motorola MC68HC05 microcontroller. It provides several system functions, including ADB and PS2.
  • Ariel II. The Ariel II video chip provides a color lookup table (CLUT) and digital-to-analog converter (DAC) for driving an AudioVision monitor.
  • Curio. The Curio is a multipurpose I/O chip that contains a Media Access Controller for Ethernet (MACE), a SCSI controller, and a Serial Communications Controller (SCC).
  • BART. The BART NuBus controller chip provides the data gateway between NuBus and the CPU bus. It acts as a CPU bus master, transferring one-cycle or four-cycle transactions.
  • Squidlet is a 28-pin chip that provides a set of synchronized system clocks for Power Macintosh computers.
  • CIVIC. The Cyclone Integrated Video Interfaces Controller (CIVIC), used in the AV card, is a CMOS chip in a 144-pin package.
  • Sebastian. The Sebastian chip is a video color palette and video digital-to-analog converter (DAC) in a 100-pin CMOS configuration, used in the AV card.
  • Mickey. The Mickey is a composite video encoder in a 28-pin advanced bipolar CMOS chip. It is used in the AV card.
  • MEMCjr. The MEMCjr IC combines functions performed by several ICs in previous Macintosh designs. Control and timing signals for the ROM, RAM, and VRAM, a frame buffer controller for the video display.
  • PrimeTime. The PrimeTime IC combines functions performed by several ICs in previous Macintosh designs. Data bus buffers for the internal I/O bus, SWIM II, interface adapters VIA1 and VIA2.
  • PrimeTime II. The PrimeTime II IC supports the I/O bus. It combines functions performed by several ICs in previous Macintosh designs.
  • DFAC II. The DFAC II custom IC contains the sound input processing devices. The DFAC II IC does not include the sound control logic and the input and output buffers; those are part of the PrimeTime IC.
  • Cuda. The Cuda IC is a custom version of the Motorola MC68HC05 microcontroller. It includes ADB, the programming interface for the DFAC II IC, real-time clock.
  • Antelope. The Antelope IC is a custom IC containing the video CLUT (color look-up table) and DAC. The Antelope IC is pin and software compatible with the AC/DC custom IC used in the Macintosh Quadra 700 and 950, but does not support 24 bits per pixel or Apple convolution.
  • F108. The F108 IC performs the system memory control functions. It also includes circuitry equivalent to the SCC and SCSI controller ICs.
  • Valkyrie. The Valkyrie IC is a custom IC containing the logic for the video display. It includes the following functions: display memory controller, video CLUT (color lookup table), video DAC (digital-to-analog converter).

See Also