M707 Teletype Transmitter

The M707 Teletype Transmitter is a double-height module designed for parallel-to-serial conversion of Teletype code. It handles the buffering, gating, and timing required to transfer data asynchronously between a parallel binary device and a serial data line. The module allows for the assembly of 5-bit or 8-bit characters into serial formats ranging from 7.0 to 11.0 units (including start and selectable stop bits) based on specific pin connections.

Key features and technical details include:

• Operational Control: It includes a flag system to indicate when a character has been transmitted and the module is ready to receive new data.
• Input/Output: It is compatible with TTL logic levels. It features specialized inputs such as "CODE SELECT" for multiplexing, "WAIT" for pausing transmission, and various flag control inputs (CLEAR FLAG 1/2, FLAG STROBE).
• Serial Output: The serial data line is driven by an open-collector PNP transistor capable of driving a variety of loads, requiring diode protection for inductive loads.
• System Integration: It can be used in half-duplex systems and is designed to integrate into digital systems, such as the PDP-15, where it typically assembles 8-bit characters into 11-unit serial sequences.
• Power: It has a maximum power dissipation of 5V at 375 mA.