docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections

Comprehensive technical documentation covering:
- Hardware: OCS/ECS/AGA custom chip registers, Copper & Blitter deep dives
- Boot sequence: cold boot through startup-sequence
- Binary format: HUNK executable spec, relocation, debug info
- Linking & ABI: .fd files, LVO tables, register calling conventions
- Exec kernel: tasks, interrupts, memory, signals, semaphores
- AmigaDOS: file I/O, FFS/OFS layout, CLI/Shell scripting
- Graphics: planar bitmaps, Copper programming, HAM/EHB modes
- Intuition: screens, windows, IDCMP, BOOPSI
- Devices: trackdisk, SCSI, serial, timer, audio, keyboard
- Libraries: utility, expansion, IFFParse, locale, ARexx
- Networking: bsdsocket API, SANA-II, TCP/IP stack comparison
- Toolchain: GCC, vasm/vlink, SAS/C, NDK, debugging
- Reverse engineering: IDA/Ghidra setup, compiler fingerprints, case studies
- CPU & MMU: 68040/060 emulation libs, PMMU, cache management
- Driver development: SANA-II, Picasso96/RTG, AHI audio

All files include breadcrumb navigation. No local paths or proprietary content.

10_devices/parallel.md

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+[← Home](../README.md) · [Devices](README.md)
+
+# parallel.device — Centronics Parallel Port
+
+## Overview
+
+`parallel.device` provides I/O for the Amiga's Centronics-compatible parallel port, used primarily for printers.
+
+---
+
+## Opening
+
+```c
+struct IOExtPar *par = (struct IOExtPar *)
+    CreateIORequest(port, sizeof(struct IOExtPar));
+OpenDevice("parallel.device", 0, (struct IORequest *)par, 0);
+```
+
+---
+
+## Commands
+
+| Code | Constant | Description |
+|---|---|---|
+| 2 | `CMD_READ` | Read bytes (if bidirectional) |
+| 3 | `CMD_WRITE` | Write bytes |
+| 5 | `CMD_CLEAR` | Clear buffers |
+| 8 | `CMD_FLUSH` | Abort pending |
+| 9 | `PDCMD_QUERY` | Get status |
+| 10 | `PDCMD_SETPARAMS` | Set parameters |
+
+---
+
+## References
+
+- NDK39: `devices/parallel.h`