The source code for Smart Terminal v.8.2 for Atari 8-bit computers, by MPP (Microbits Peripheral Products) for use with MPP modems.

Assembly language source code for the Mac/65 assembler.

Date is either 8-13-1986 or 3-13-1986, depending on how you interpret the writing.
Also see https://archive.org/details/MPPSmartTerminal and https://archive.org/details/MPPSmartTerminalv4.1