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.

11_libraries/mathffp.md

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+[← Home](../README.md) · [Libraries](README.md)
+
+# Math Libraries — Floating Point
+
+## Overview
+
+AmigaOS provides multiple math libraries for floating-point operations. The 68000 has no FPU, so all math is done in software unless a 68881/68882/68040/68060 FPU is present.
+
+---
+
+## Library Stack
+
+| Library | Format | Description |
+|---|---|---|
+| `mathffp.library` | FFP (Motorola Fast Floating Point) | Original Amiga format (32-bit) |
+| `mathieeesingbas.library` | IEEE 754 single (32-bit) | IEEE single precision |
+| `mathieeedoubbas.library` | IEEE 754 double (64-bit) | IEEE double precision |
+| `mathtrans.library` | FFP | Transcendental functions (sin, cos, sqrt) |
+| `mathieeesingtrans.library` | IEEE single | IEEE single transcendentals |
+| `mathieeedoubtrans.library` | IEEE double | IEEE double transcendentals |
+
+---
+
+## FFP Format
+
+Motorola FFP is NOT IEEE 754:
+```
+Bits 31–8: 24-bit mantissa (normalised, implicit 1.xxx)
+Bits  7–1: 7-bit exponent (excess-64)
+Bit     0: sign (0=positive, 1=negative)
+```
+
+---
+
+## Using IEEE Math
+
+```c
+struct Library *MathIeeeSingBasBase =
+    OpenLibrary("mathieeesingbas.library", 0);
+
+float a = 3.14f;
+float b = 2.0f;
+float c = IEEESPMul(a, b);  /* 6.28 */
+float d = IEEESPAdd(a, b);  /* 5.14 */
+float e = IEEESPDiv(a, b);  /* 1.57 */
+
+CloseLibrary(MathIeeeSingBasBase);
+```
+
+---
+
+## 68881/68882 FPU
+
+When an FPU is present, the math libraries are replaced with ROM patches that use native FPU instructions. The application code is identical — the library transparently switches to hardware.
+
+```c
+if (SysBase->AttnFlags & AFF_68881) {
+    /* 68881/68882 FPU present */
+}
+if (SysBase->AttnFlags & AFF_FPU40) {
+    /* 68040 internal FPU */
+}
+```
+
+---
+
+## References
+
+- NDK39: `libraries/mathffp.h`, `libraries/mathieeesp.h`