Hitachi, Ltd.

Hitachi Engineering Co., Ltd.

Kazuhisa Inada

Shigeo Kuboki

Norihiko Sugimoto

Masahiro Ueno

Yasushi Nakamura

Toshihiko Tominaga

Tomoaki Aoki

Takeshi Harakawa

Shunji Inada

Eiki Kondoh

Syunji Inada

In a data communication adapter apparatus for a digital data communication connected between a signal transmission path for transmitting both receive data and transmit data, and a host processor unit for producing frame data to output the frame data therefrom, an internal host bus is newly employed in the data communication apparatus irrelevant to the employment of a CPU dedicated bus, and the transmission/reception data generated and interpreted by the host processor is transferred via the internal host bus, a bus interface, and a system data bus between a transmission memory or a reception memory and a buffer memory. Furthermore, a reception memory (host dedicated reception memory) for storing only the reception data to be interpreted by the host processor is separately provided with another reception memory (CPU dedicated reception memory) for storing only the reception data to be interpreted by a CPU, one reception data to be interpreted by the CPU is once transferred from the transmission/reception control unit to the CPU dedicated memory and thereafter read out via the CPU dedicated bus under the control of the CPU, and the other reception data to be interpreted by the host processor is one stored in the host dedicated reception memory and then read out via the internal host bus and bus interface under the control of the host processor.

Data communication adapter and data communication terminal apparatus for

In a program control apparatus with a program ROM which forms sequence control signals for executing various control actions according to specified conditions, a memory circuit is provided which is activated during a particular operation mode to successively store information corresponding to the external conditions and also information on times taken by the operation sequence of the program control apparatus.

Program control apparatus incorporating a trace function

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Hitachi, Japan

Kazuhisa Inada