Mitac 8080 Service Manual - laptop schematics, notebook ...

8080 N/B Maintenance
The NS PC87393 LPC Super I/O device is targeted for a wide range of portable applications. PC99 and ACPI
compliant, it also incorporates: a Floppy Disk Controller (FDC), two enhanced Serial Ports (UARTs), one with Fast
Infrared (FIR, IrDA 1.1 compliant), General-Purpose Input/Output (GPIO) support for a total of 32 ports, Interrupt
Serializer for Parallel IRQs and an enhanced WATCHDOG timer.
The NS PC87393 Super I/O controller integrates the standard PC I/O functions: LPC bus interface, X-Bus Extension
for read and write operations, floppy disk interface and one EPP/ECP capable parallel port. Like all LPC Super I/O
devices, the PC87393 offers a single-chip solution to the most commonly used PC I/O peripherals to provide for the
increasing number of multimedia application.
The STAC9750 is a 2 channel, 20-Bit DAC and 20-Bit ADC, full duplex AC’97 2.2 compatible stereo audio CODEC
designed for PC multimedia systems, including soft/host audio and riser card base design. The STAC9750 supports
with independent variable hardware sampling rates. The STAC9750 CODEC provides two pairs of stereo outputs with
independent volume control, a mono output, a headphone output, and multiple stereo and mono inputs, alone with
flexible mixing, gain and mute functions to provide a complete integrated audio solution for PCs. The STAC9750 also
support an AC’97 2.2 compliant S/PDIF out functions which allows easy connection from the PC to consumer
electronic products.
The CH7011A is a display controller device which accepts a digital graphics input signal, and encodes and transmits
data to a TV output (analog composite, s-video or RGB). The device accepts data over one 12-bit wide variable
voltage data port which supports five different data format including RGB and YcrCb. The TV-Out processor will
perform non-interlace to interlace conversion with scaling and flicker filters, and encode the data into any of the
NTSC or PAL video standards. The scaling and flicker filter is adaptive and programmable to enable superior text
display. Eight graphics resolutions are supported up to 1024 X 768 with full vertical and horizontal underscan
capability in all modes. A high accuracy low jitter phase locked loop is integrated to create outstanding video quality.
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