Parallel Interface; Keyboard Controller; Pc Cardbus Controller; Sound Integrated Circuit - NEC VERSA 6220 Service Manual

1-20 Technical Information

Parallel Interface

The PC87338VJG chip is a 100-pin Thin Quad Flat Plastic (TQFP) chip. The controller
changes 8-bit parallel data into serial data and writes the data to the diskette. Conversely,
the serial data is transmitted from the diskette into parallel data, where it remains until the
read operation takes place.
Additional PC87338VJG chip operations include:
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ISA compatibility
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low-power CMOS with enhanced power-down mode

Keyboard Controller

The keyboard controller (M38813E) supports a PS/2-style keyboard, mouse and password
security feature. Refer to Appendix A for keyboard interface connector pin assignments.
When data is written to the output buffer, the controller generates an interrupt, and requests
the CPU to receive the data. The controller automatically adds an even parity bit to the data
sent and waits for a response. The device must acknowledge that the data was successfully
received by sending a response to the controller for each byte of data received.

PC CardBus Controller

The Texas Instruments PC1131 controller interfaces with the PCI bus, PC CardBus socket
and configuration registers to provide:
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compliant with PCI 2.1 and 1995 PC card standards
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CardBus slots with hot insertion and removal
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independent Read and Write buffers for each direction
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burst transfers to maximize data throughput on the PCI CardBus bus.

Sound Integrated Circuit

The ESS Technologies chip set ES1869 provides dynamic audio circuitry with the follow-
ing:
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Audio digital processor
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Plug and Play support
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High-performance 16-bit Stereo Codec
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Full-duplex operation for simultaneous record and playback
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Analog joystick quad timer and digital joystick support.