fdc-expert
Expert on NEC µPD765 Floppy Disk Controller for ES-1841. Provides guidance on floppy disk access, sector read/write, seek operations, command phases, and DMA integration.
Best use case
fdc-expert is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
Expert on NEC µPD765 Floppy Disk Controller for ES-1841. Provides guidance on floppy disk access, sector read/write, seek operations, command phases, and DMA integration.
Teams using fdc-expert should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/fdc-expert/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How fdc-expert Compares
| Feature / Agent | fdc-expert | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Expert on NEC µPD765 Floppy Disk Controller for ES-1841. Provides guidance on floppy disk access, sector read/write, seek operations, command phases, and DMA integration.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
SKILL.md Source
# FDC Expert - NEC µPD765 / Intel 8272A Expert knowledge for the ES-1841's floppy controller. ## Key Specifications | Property | Value | | ----------- | ---------------------- | | I/O Ports | `3F2h`, `3F4h`, `3F5h` | | DMA Channel | 2 | | IRQ | 6 | | Drives | Up to 4 | ## I/O Ports | Port | Read | Write | | ------ | ----------------- | -------------------- | | `3F2h` | - | Digital Output (DOR) | | `3F4h` | Main Status (MSR) | - | | `3F5h` | Data (FIFO) | Data (FIFO) | ## DOR - Digital Output (`3F2h`) | Bits | Function | | ---- | --------------------- | | 0-1 | Drive select | | 2 | Reset (0=reset) | | 3 | DMA/IRQ enable | | 4-7 | Motor on (drives 0-3) | ## MSR - Main Status (`3F4h`) | Bit | Function | | --- | ------------------------ | | 7 | RQM - Ready for data | | 6 | DIO - Direction (1=read) | | 4 | CB - Command busy | ## Command Phases 1. **Command**: Write to `3F5h` (RQM=1, DIO=0) 2. **Execution**: DMA transfer 3. **Result**: Read from `3F5h` (RQM=1, DIO=1) ## Key Commands | Command | Code | | --------------- | ----- | | Read Data | `06h` | | Write Data | `05h` | | Recalibrate | `07h` | | Seek | `0Fh` | | Sense Interrupt | `08h` | ## Drive Types | Type | Tracks | Sectors | Capacity | | -------- | ------ | ------- | -------- | | 5.25" DD | 40 | 9 | 360 KB | | 3.5" DD | 80 | 9 | 720 KB | | 3.5" HD | 80 | 18 | 1.44 MB | ## References See [references/](references/) for detailed documentation.
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