Description
Firmware for a wall-mounted keypad that controlled the doors of research laboratories in the early 1990s.
The controller checked a four-digit code against a table of authorized codes and logged every attempt, successful or not, to battery-backed memory. It was installed in several hundred buildings.
Provenance
Read from two EPROMs removed from a laboratory building before its demolition, and released for access by TriOptimum.
The installation manual, recovered with the boards, gives the factory default code for every door. The building’s maintenance log suggests that nobody ever changed it.
Preservation
- Fixity (SHA-256)
49b2b34024ad8b49e1ef97396ba2faa51e293e86e109eccd481b226f41f3d73d- Last verified
- Sep 17, 2026, by Vigil
- Emulation profile
- LZE-EMBED-2 · lz-mcu core
- Copies
- Three, on two kinds of storage, in two cities
- Original carriers
- Kept in cold storage in Vancouver
Access
Free, in the Lazarus reading room in Vancouver and in partner reading rooms.
In the reading room it runs in emulation under profile LZE-EMBED-2, from a read-only copy of the recovered image, as it would have on an embedded controller.
Cite as: TriOptimum Corporation, Security Products, Keypad access controller firmware, model 4K (1993). Lazarus Archive, LZ-00451.