Matsushita Electric Industrial Co., Ltd.

Tsutomu Miyoshi

Akihiko Nakamura

Makoto Mitsuda

Masao Okabe

Junji Soga

Yutaka Ohta

Masafumi Sato

Katsuyuki Tamai

Masako Sawada

An external expansion bus interface circuit is provided for connecting a peripheral to a micro control unit to exchange digital information under an external expansion memory mode of the micro control unit. For this purpose, the eternal expansion bus interface circuit includes a means for storing a writing data. Address decoder and a strobe decoder are connected to the micro control unit to directly receive the writing data, an address strobe, and a write strobe. Then the address decoder and strobe decoder produce a write enable signal for enabling the memory to store the data at address designated thereby.

External expansion bus interface circuit for connecting a micro control

A memory is provided in a tape cassette and it consists of a program information area for recording information on each program recorded on a tape and a tape information area for recording information on the entire tape. If this tape cassette is used by a video cassette recorder having a full function to drive the memory and by a video cassette recorder having a limited function to drive it, the program information recorded in the memory is consistent with the programs actually recorded on the tape. For example, a tape erasing prevention flag is set in the tape information area, while a program erasing prevention flag is set for each program in the program information area. In a different example, a tape inconsistency flag is set in the tape information area, while a program inconsistency flag is set for each program in the program information area. The data in the memory can be corrected by using such flags according to the programs actually recorded on the tape.

Recording apparatus using a tape cassette with a memory

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Neyagawa, Japan

Tsutomu Miyoshi