The manual describes the Central Data Octal Serial Interface board, its features, installation, operation, and specifications.
The Central Data Octal Serial Interface board expands the serial I/O capacity of any Multibus system. It uses a Signetics 2651 USART to provide eight independent RS‑232 channels with selectable baud rates and address options.
The document covers general information, functional description, principles of operation, addressing, bus interface, USART section, installation/user selectable options, specifications, and schematics, providing engineers with the details needed to configure and integrate the board.
| Word Size | 8 bits |
|---|---|
| I/O Ports Required | 32 ports |
| RS‑232 Signal Lines | TxD, RxD, DTR, RTS, CTS, DSR |
| Clock Frequency | 5.0688 MHz |
| USART Chip | Signetics 2651 |
| Interrupt Sources | Transmitter empty or receiver full |
The board requires 32 I/O ports.
A 5.0688 MHz crystal oscillator provides the clock for the USARTs.