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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

scsi.device — Hard Disk I/O

Overview

SCSI and IDE hard disks are accessed via scsi.device (A3000/A4000 built-in) or 2nd.scsi.device / ide.device (A1200/A600). The API is the same as trackdisk for basic read/write, with additional SCSI direct commands.

Opening

struct IOStdReq *scsi = CreateStdIO(port);
OpenDevice("scsi.device", 0, (struct IORequest *)scsi, 0);
/* unit 0 = first SCSI/IDE device */

Standard Commands

Same as trackdisk: CMD_READ, CMD_WRITE, CMD_UPDATE, TD_CHANGENUM, etc.

Direct SCSI Commands (HD_SCSICMD)

struct SCSICmd scsicmd;
UBYTE cdb[10];    /* SCSI CDB */
UBYTE sense[20];  /* sense data buffer */
UBYTE data[512];  /* data buffer */

/* Read 1 sector at LBA 0: */
cdb[0] = 0x28;    /* READ(10) */
cdb[1] = 0;
cdb[2] = 0; cdb[3] = 0; cdb[4] = 0; cdb[5] = 0;  /* LBA = 0 */
cdb[6] = 0;
cdb[7] = 0; cdb[8] = 1;  /* transfer length = 1 sector */
cdb[9] = 0;

scsicmd.scsi_Data      = (UWORD *)data;
scsicmd.scsi_Length     = 512;
scsicmd.scsi_Command    = cdb;
scsicmd.scsi_CmdLength  = 10;
scsicmd.scsi_Flags      = SCSIF_READ;
scsicmd.scsi_SenseData  = sense;
scsicmd.scsi_SenseLength = sizeof(sense);

scsi->io_Command = HD_SCSICMD;
scsi->io_Data    = &scsicmd;
scsi->io_Length  = sizeof(scsicmd);
DoIO((struct IORequest *)scsi);

if (scsicmd.scsi_Status != 0) {
    /* SCSI error — check sense data */
}

References

NDK39: devices/scsidisk.h
ADCD 2.1: scsi.device autodocs

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