mirror of https://github.com/alfishe/amiga-bootcamp.git synced 2026-06-13 00:26:28 +00:00

Ilia Sharin 21751c0025 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.

2026-04-23 12:17:35 -04:00

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← Home · Devices

trackdisk.device — Floppy Disk I/O

Overview

trackdisk.device provides raw sector I/O for Amiga floppy drives. Each drive is a unit (0–3). The device operates on 512-byte sectors, 11 sectors per track (880 KB DD disks) or 22 per track (1760 KB HD).

Opening

struct IOExtTD *tdreq = (struct IOExtTD *)
    CreateIORequest(port, sizeof(struct IOExtTD));
OpenDevice("trackdisk.device", 0, (struct IORequest *)tdreq, 0);

Commands

Code	Constant	Description
2	`CMD_READ`	Read sectors
3	`CMD_WRITE`	Write sectors
4	`CMD_UPDATE`	Flush write buffer to disk
9	`TD_MOTOR`	Turn motor on/off
10	`TD_FORMAT`	Low-level format track
11	`TD_SEEK`	Move head to track
12	`TD_REMOVE`	Notify on disk change
13	`TD_CHANGENUM`	Get disk change count
14	`TD_CHANGESTATE`	Check if disk present
15	`TD_PROTSTATUS`	Check write-protect
16	`TD_RAWREAD`	Read raw MFM data
17	`TD_RAWWRITE`	Write raw MFM data
18	`TD_GETDRIVETYPE`	Get drive type
19	`TD_GETNUMTRACKS`	Get total tracks
20	`TD_ADDCHANGEINT`	Add disk change interrupt
21	`TD_REMCHANGEINT`	Remove disk change interrupt

Reading a Sector

UBYTE buf[512];
tdreq->iotd_Req.io_Command = CMD_READ;
tdreq->iotd_Req.io_Data    = buf;
tdreq->iotd_Req.io_Length  = 512;
tdreq->iotd_Req.io_Offset  = 0;   /* byte offset = sector * 512 */
DoIO((struct IORequest *)tdreq);

Disk Geometry

Parameter	DD (880 KB)	HD (1760 KB)
Heads	2	2
Cylinders	80	80
Sectors/track	11	22
Bytes/sector	512	512
Total sectors	1760	3520

Byte offset = (cylinder * 2 + head) * sectors_per_track * 512 + sector * 512

References

NDK39: devices/trackdisk.h
ADCD 2.1: trackdisk.device autodocs

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