DEC PT1110414 Async Controller

Product Description

The DEC PT1110414 is an asynchronous controller card manufactured by Digital Equipment Corporation. This type of card was fundamental in enabling serial communication for DEC's range of minicomputers and workstations. Asynchronous communication, unlike synchronous methods, does not rely on a shared clock signal between the sender and receiver; instead, data is transmitted character by character, with start and stop bits framing each character to maintain synchronization. This controller card would typically interface with the computer's backplane or bus system, such as DEC's proprietary Q-Bus or UNIBUS architectures. It would provide one or more serial ports, commonly configured as RS-232 interfaces, which are standard connectors for serial devices. These ports allowed the computer to communicate with a variety of peripherals, including modems for remote access, serial printers, terminals for user interaction, or other serial data acquisition devices. The PT1110414 served as a crucial link for input/output operations in environments where serial connectivity was prevalent. Its role was to handle the low-level details of serial data transmission and reception, freeing up the main processor to perform other tasks. This card is representative of the essential I/O hardware that underpinned the functionality of many computer systems from DEC's product lines.