Full Reverse Engineering of the TI-84 Plus Operating System
This article provides a technical breakdown of the reverse engineering process for the TI-84 Plus graphing calculator's operating system. It details the Z80 architecture, memory paging schemes, and the system-call mechanism used to manage the device's flash and RAM.
Why it matters
It serves as a deep-dive resource for hardware enthusiasts and developers interested in legacy embedded systems and calculator modification.
Target: ti84plus.rom (1 MiB flash dump). OS self-identifies as 2.55MP. CPU: Zilog Z80 (16-bit address bus, 64 KiB logical space) with hardware flash/RAM paging. Ghidra project: ti84.gpr (rebuild: tools/build.sh ).
The content is purely technical and descriptive, lacking any political or social bias.
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