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.

07_dos/process_management.md

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+[← Home](../README.md) · [AmigaDOS](README.md)
+
+# Process Management — CreateNewProc, SystemTagList, Execute
+
+## Overview
+
+AmigaDOS provides several ways to launch child processes, ranging from the low-level `CreateNewProc` to the shell-level `Execute` and `SystemTagList`.
+
+---
+
+## CreateNewProcTags (OS 2.0+)
+
+```c
+/* dos/dostags.h — NDK39 */
+struct Process *proc = CreateNewProcTags(
+    NP_Entry,       myFunction,     /* function pointer */
+    NP_Name,        "Worker",       /* task name */
+    NP_StackSize,   8192,           /* stack size in bytes */
+    NP_Priority,    0,              /* scheduling priority */
+    NP_Input,       Open("NIL:", MODE_OLDFILE),
+    NP_Output,      Open("NIL:", MODE_NEWFILE),
+    NP_CloseInput,  TRUE,           /* close input on exit */
+    NP_CloseOutput, TRUE,
+    NP_CurrentDir,  DupLock(currentDir),
+    TAG_DONE);
+```
+
+### Tag Constants
+
+| Tag | Value | Meaning |
+|---|---|---|
+| `NP_Entry` | — | Function to run as the new process |
+| `NP_Seglist` | — | Alternative: run from a loaded segment list |
+| `NP_Name` | — | Process name (appears in task list) |
+| `NP_StackSize` | — | Stack size in bytes (default 4096) |
+| `NP_Priority` | — | Task priority (−128 to +127) |
+| `NP_Input` | — | BPTR stdin handle |
+| `NP_Output` | — | BPTR stdout handle |
+| `NP_Error` | — | BPTR stderr handle (OS 3.0+) |
+| `NP_CurrentDir` | — | Lock for current directory |
+| `NP_HomeDir` | — | Lock for PROGDIR: |
+| `NP_CopyVars` | — | Copy parent's local vars to child |
+
+---
+
+## SystemTagList — Run a Shell Command
+
+```c
+/* Execute a command string as if typed in a shell: */
+LONG rc = SystemTagList("dir SYS: ALL", NULL);
+/* rc = return code from the command */
+
+/* With custom I/O: */
+LONG rc = SystemTagList("list RAM:", (struct TagItem[]){
+    { SYS_Input,  Open("NIL:", MODE_OLDFILE) },
+    { SYS_Output, Open("RAM:output.txt", MODE_NEWFILE) },
+    { TAG_DONE, 0 }
+});
+```
+
+---
+
+## Execute — Legacy Command Execution
+
+```c
+/* dos.library LVO −132 */
+BOOL Execute(STRPTR command, BPTR input, BPTR output);
+```
+
+- `command` — shell command string
+- `input` — BPTR to additional input (0 = none)
+- `output` — BPTR to output handle (0 = current)
+
+---
+
+## WaitForChild / Process Exit
+
+Child processes are independent tasks. To synchronize:
+1. Use a shared `MsgPort` — child sends a death message
+2. Check `pr_Result2` after the child task exits
+3. Use `SYS_Asynch` tag with `SystemTagList` for fire-and-forget
+
+---
+
+## References
+
+- NDK39: `dos/dostags.h`, `dos/dosextens.h`
+- ADCD 2.1: `CreateNewProc`, `SystemTagList`, `Execute`
+- `06_exec_os/tasks_processes.md` — Task/Process structures