MSM7000

The MSM7000 is a very early single-chip integrated circuit from Oki Electric Industry Co., Ltd. It's historically significant as one of the first single-chip LSI (Large Scale Integration) modem chipsets designed for data transmission. It was commonly used in applications like point-of-sale (POS) terminals, electronic cash registers, and other low-speed data communication devices in the late 1970s and early 1980s.

Its primary function was to handle the modulation and demodulation of audio frequency-shift keying (AFSK) signals, allowing digital data to be transmitted over telephone lines or other audio channels. The chip integrated many of the discrete components previously required for these functions, reducing the size, cost, and complexity of modem implementations.

The MSM7000 offered features such as transmit and receive filters, modulator and demodulator circuits, and control logic. While its data transmission rates were relatively low by modern standards (typically 300 baud), it was a crucial component in enabling early forms of electronic data exchange before the widespread adoption of faster and more sophisticated modem technologies. It played a role in the development of early computerized business systems and remote data entry.