1. DCL (Digital Command Language)
Calling DCL a “language” might seem like a stretch, but anyone who truly lived inside a VMS system knows it was far more than a simple command-line shell. DCL was your environment. It was a powerful scripting language with variables, logicals, and control
structures that let you automate complex tasks with an English-like, readable syntax. Unlike the often-cryptic commands of early Unix, DCL was verbose and consistent. Commands like `DIRECTORY/SIZE/DATE` were self-explanatory. This philosophy—that the system should be powerful yet intelligible—was core to the DEC experience. If you loved the feeling of mastering a system through its native tongue, you loved DCL.
2. VAX FORTRAN
On the scientific and engineering workstations where DEC dominated, FORTRAN was king. But VAX FORTRAN was a special dialect. It was heavily optimized for the VAX hardware and deeply integrated with the VMS operating system, allowing programmers to make system calls and access VMS-specific features directly from their code. This created a tight, high-performance bond between application and OS. For engineers running complex simulations or crunching massive datasets, VAX FORTRAN offered raw power combined with the stability of the VMS platform. It represented the workhorse mentality of DEC: build powerful, reliable tools for people doing serious work.
3. BLISS
If you wanted to get closer to the machine, you used BLISS. Standing for "Basic Language for Implementation of System Software," BLISS was the language DEC itself used to write the VMS operating system. It was a systems implementation language that, like C, offered low-level control but with some unusual features. BLISS was typeless and expression-oriented, and famously required programmers to explicitly dereference pointers to get a variable's value. It was a language for engineers who thought deeply about machine architecture. While it never gained widespread commercial use, it was central to DEC's internal culture and the creation of its crown jewel, VMS. Loving BLISS means appreciating the raw, uncompromising craft of building an operating system from the ground up.
4. BASIC-PLUS
Before becoming VAX BASIC on VMS, this powerful dialect started life as BASIC-PLUS on DEC's PDP-11 systems. Forget the simple BASIC you might have learned on a home computer; DEC's BASIC was a serious development language. It included strong file-handling capabilities, direct integration with the Record Management Services (RMS) of VMS, and structured error handling. It was robust enough to build significant business applications, blending the accessibility of BASIC with the industrial-strength features of the VMS environment. It proved that a language could be both approachable and powerful, a very DEC-like compromise.
5. C
While BLISS was DEC's internal choice, C was the lingua franca of the burgeoning Unix world and became a first-class citizen on VMS. What would appeal to a DEC fan is C's ethos of being a high-level language that doesn't hide the machine. It gives you direct memory access through pointers and trusts the programmer to know what they're doing—a philosophy familiar to VMS power users. Furthermore, Dave Cutler, one of the key architects of VMS, would later lead the development of Windows NT, an operating system heavily influenced by VMS principles and written primarily in C. For a DEC enthusiast, learning C is like studying the architectural DNA that connects the VMS world to the operating systems that power much of today's computing landscape.
