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The D16/M is a general-purpose, stored-program, single-address, 16-bit digital computer using two’s complement arithmetic. It manages subroutine calls and interrupts using a memory stack. The processor may directly address 64K words of memory or I/O. Its timing and control unit is microprogrammed (fully horizontal, with a 72-bit control word).

As presently configured, the D16 has 73 unique processor instructions. There are eight addressing modes: Implied, Immediate, Direct, Indirect, Post-Incremented Indirect, Direct Indexed, Indirect Indexed, and Post-Incremented Indirect Indexed (see the D16 Instruction Set for details).

The machine is implemented in SSI and MSI HCMOS integrated logic and constructed using wire-wrap techniques. It is packaged in a 6U (10.5 inch) rack-mount enclosure, and has a 100-pin bus for main memory (CMOS SRAM) and peripheral interfaces.