Keyboard Controller; Pc Card Controller; Sound Integrated Circuit - NEC VERSA 2600 Service Manual

1-18 Technical Information

Keyboard Controller

The keyboard controller (H8/3434) 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 Card Controller

The O2 Micro OZ6730D controller 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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PC Card slots with hot insertion and removal
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independent Read and Write buffers for each direction

Sound Integrated Circuit

The ESS1688 chip is a single combo chip. This dynamic audio circuitry provides the fol-
lowing:
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ISA 16-bit bus interface chip
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audio digital processor
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Plug and Play support
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high performance 16-bit Sigma Delta Stereo Codec
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Sound Blaster™ 16 register compatible mixer with AGC
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built-in analog joystick quad timer.