GoKawiilAnnotated disassembly published for original VT100 terminal firmware
A developer has produced a fully annotated disassembly of the original 8 KiB firmware used in DEC's 1978 VT100 terminal, which ran on an Intel 8080 microprocessor. The documentation cross-references the firmware code with DEC's original Technical Manual and print set to explain how the terminal's functions were implemented.
GoKawiil's interpretation of the reporting above, not reported fact.
The VT100's escape sequence behavior, later refined in the VT101 and VT102, became the de facto 'VT100 compatible' standard that DEC documented and other vendors followed for about 15 years, so understanding its firmware sheds light on a foundational piece of terminal emulation history still referenced today. Detailed annotation work like this can help retrocomputing enthusiasts, emulator authors, and historians verify and preserve knowledge of early microprocessor-based hardware design.
- The VT100, released in 1978, was DEC's first ANSI-compatible terminal and first to use a microprocessor (Intel 8080) instead of discrete logic.
- Minor firmware changes in the follow-on VT101 and VT102 models defined the lasting industry standard for 'VT100 compatible' behavior.
- The new annotated disassembly links the original 8 KiB firmware code to DEC's Technical Manual and print set for detailed explanation.
VT100 Terminal Replica Keyboard by Qwerkywriter — If you're diving into the VT100's firmware internals, why not pair that nostalgia with some retro-styled hardware on your desk? A mechanical keyboard with a vintage terminal aesthetic captures the same DEC-era charm while being fully usable with modern machines. It's a fun way to bring the spirit of classic computing into your daily workflow.
See VT100 Terminal Replica Keyboard by Qwerkywriter on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: vt100.net, 2026-10-19
Published there as: “The Annotated VT100 Firmware (2022)”
Read the original report → The summary and analysis above are GoKawiil's own, written from reporting by the source above. Facts and quotes belong to the original publisher.