Main project hub for the Z80 Sudoku solver implementation in Z80 assembly. ← Back to CONTENTS
• Status — Current progress and next steps
• Design Overview — High-level architecture and approach
• Design Doc — Primary design document for the Z80 Sudoku solver
• Algorithm — Algorithm design and approach
• Candidate Mask Design — Bitfield representation of possible values per cell
• Row/Column/Box Scan Design — Constraint propagation scan algorithm
• Solver Control Structure — Main loop and control flow design
• Memory Map — Memory map overview
• Detailed Memory Layout — Full memory map with addresses and sizes
• Register Conventions — Detailed register usage conventions
• Register Conventions (code) — Z80 register allocation plan (code-level)
• Solver Code — Main solver code
• Candidate Mask Builder — Z80 assembly implementation of the candidate mask routine
• Backtracking — Backtracking algorithm notes
• Z80 Instruction Set — Complete 491-instruction reference with opcodes, T-states, and flags. Instructions marked [UND] are undocumented (present in real Z80 silicon but absent from the Zilog manual). Instructions marked [Z80N] are ZX Spectrum Next hardware extensions — not part of the standard Z80 at all. Only use [UND] or [Z80N] instructions if explicitly asked to.