DUV11 Line Interface
The DUV11 Line Interface is a synchronous serial line interface for the QBUS. It used programmed I/O (with separate receive and transmit interrupts) to transfer data; it was double-buffered for both input and output.
It provided an EIA RS-232 interface (to Bell 200 series modems, such as the model 201, and equivalents). Baud rates of up to 9.6K bits/second were supported by the EIA interface.
The character length (5, 6, 7 or 8 bits), and the sync character, were selectable; parity (even or odd) was optionally supported for error detection. It could also be set to discard additional incoming sync characters; it could operate in either half-duplex or full-duplex mode. All configuration, as well as all the modem control leads, could be set under program control. A switch allows configuration of whether one or two contiguous sync characters is needed for synchronization.
It was a quad-width card, the M7591; a Berg header on the card provided the 'native' EIA interface. For operation without a modem, an external clock could be used; a switch-selectable option also allowed the use of an internal clock.
Registers
| Register | Abbreviation | Address |
|---|---|---|
| Receiver Status Register | RxCSR | 16xx10 |
| Receiver Data Buffer Register (read only) | RxDBUF | 16xx12 |
| Parameter Control Register (write only) | PARCSR | 16xx12 |
| Transmitter Status Register | TxCSR | 16xx14 |
| Transmitter Data Buffer Register | TxDBUF | 16xx16 |
The address should be allocated from the floating device address space; it is factory-configured to 0160010. It uses a single interrupt vector (for 'done'), which should be allocated from the floating device vectors; it is factory-configured to 0440.
See also
Further reading
- DUV11 User Manual (EK-DUV11-OP) - not available online
- DUV11 Field Maintenance Print Set (MP-00297) - not available online
External links
- DUV11 line interface technical manual (EK-DUV11-TM)-001
