Usage hints and coding preferences for Intel 8085 extended (undocumented) instructions, using Zilog mnemonics. Strong rule: stack-only locals and intermediates; static/BSS only for state that must survive across function calls — never for intermediate storage. Prefer when choosing idioms for stack frames, reentrancy, 16/32-bit shifts, K-flag loops, sub hl,bc compares, or optimizing 8085 assembly beyond the bare opcode map. Complements /opcode-reference. Use when the user runs /extended-usage or asks how to use 8085 extended ops effectively.
EnglishIntel 8085 opcode reference using Zilog (Z80-style) mnemonics. Covers the full 256-opcode map, byte sizes, cycle timings, flag effects (including undocumented K and V), and the ten undocumented 8085 instructions. Use when writing, reading, optimizing, or reviewing 8085 assembly; when mapping Intel↔Zilog mnemonics; when checking timings or flags; or when the user runs /opcode-reference.
Englishz88dk newlib vs classic architecture for targets, CRT m4 driver instantiation, serial/character FILE wiring, disk fcntl (asmtargetopen, openmax, FCB vs FatFs), mixed multi-CPU trees, and targetio / ticks verification. Use when migrating targets, adding serial or disk drivers, debugging fopen/open link errors, dual-stack file I/O, CP/M stdio devices, or reviewing CRT/config lists. Complements z88dk-tooling (measure) and extended-usage (8085 codegen).
EnglishHow to use z88dk host tools to measure, profile, and diagnose 8085 (and related) code in the z88dk tree: z88dk-ticks timing and debugger, hotspots, map/nm/disassembly, suite tests, A/B library swaps, z88dk-copt peephole rules (and what they mean for hand-written library asm vs compiler output), and common measurement pitfalls. Use when optimising library asm, writing or reviewing sccz80/copt-shaped codegen, explaining benchmark deltas, verifying regressions, running +test -clib=8085, or the user runs /z88dk-tooling.
English
AGENT SKILLS ATLASIncludes Extended Usage, Opcode Reference, Z88dk Tooling, and other workflows.
Claude Code
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GitHub Copilot
Gemini CLISupported by the Atlas install prompt. Skill-specific requirements vary.
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What’s included
Extended Usage
Usage hints and coding preferences for Intel 8085 extended (undocumented) instructions, using Zilog mnemonics. Strong rule: stack-only locals and intermediates; static/BSS only for state that must survive across function calls — never for intermediate storage. Prefer when choosing idioms for stack frames, reentrancy, 16/32-bit shifts, K-flag loops, sub hl,bc compares, or optimizing 8085 assembly beyond the bare opcode map. Complements /opcode-reference. Use when the user runs /extended-usage or asks how to use 8085 extended ops effectively.
Opcode Reference
Intel 8085 opcode reference using Zilog (Z80-style) mnemonics. Covers the full 256-opcode map, byte sizes, cycle timings, flag effects (including undocumented K and V), and the ten undocumented 8085 instructions. Use when writing, reading, optimizing, or reviewing 8085 assembly; when mapping Intel↔Zilog mnemonics; when checking timings or flags; or when the user runs /opcode-reference.
Z88dk
z88dk newlib vs classic architecture for targets, CRT m4 driver instantiation, serial/character FILE wiring, disk fcntl (asmtargetopen, openmax, FCB vs FatFs), mixed multi-CPU trees, and targetio / ticks verification. Use when migrating targets, adding serial or disk drivers, debugging fopen/open link errors, dual-stack file I/O, CP/M stdio devices, or reviewing CRT/config lists. Complements z88dk-tooling (measure) and extended-usage (8085 codegen).
Z88dk Tooling
How to use z88dk host tools to measure, profile, and diagnose 8085 (and related) code in the z88dk tree: z88dk-ticks timing and debugger, hotspots, map/nm/disassembly, suite tests, A/B library swaps, z88dk-copt peephole rules (and what they mean for hand-written library asm vs compiler output), and common measurement pitfalls. Use when optimising library asm, writing or reviewing sccz80/copt-shaped codegen, explaining benchmark deltas, verifying regressions, running +test -clib=8085, or the user runs /z88dk-tooling.
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