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67 lines
1.5 KiB
Markdown
67 lines
1.5 KiB
Markdown
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[← Home](../README.md) · [Devices](README.md)
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# scsi.device — Hard Disk I/O
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## Overview
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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.
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---
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## Opening
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```c
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struct IOStdReq *scsi = CreateStdIO(port);
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OpenDevice("scsi.device", 0, (struct IORequest *)scsi, 0);
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/* unit 0 = first SCSI/IDE device */
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```
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---
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## Standard Commands
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Same as trackdisk: `CMD_READ`, `CMD_WRITE`, `CMD_UPDATE`, `TD_CHANGENUM`, etc.
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---
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## Direct SCSI Commands (HD_SCSICMD)
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```c
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struct SCSICmd scsicmd;
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UBYTE cdb[10]; /* SCSI CDB */
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UBYTE sense[20]; /* sense data buffer */
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UBYTE data[512]; /* data buffer */
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/* Read 1 sector at LBA 0: */
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cdb[0] = 0x28; /* READ(10) */
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cdb[1] = 0;
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cdb[2] = 0; cdb[3] = 0; cdb[4] = 0; cdb[5] = 0; /* LBA = 0 */
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cdb[6] = 0;
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cdb[7] = 0; cdb[8] = 1; /* transfer length = 1 sector */
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cdb[9] = 0;
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scsicmd.scsi_Data = (UWORD *)data;
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scsicmd.scsi_Length = 512;
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scsicmd.scsi_Command = cdb;
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scsicmd.scsi_CmdLength = 10;
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scsicmd.scsi_Flags = SCSIF_READ;
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scsicmd.scsi_SenseData = sense;
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scsicmd.scsi_SenseLength = sizeof(sense);
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scsi->io_Command = HD_SCSICMD;
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scsi->io_Data = &scsicmd;
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scsi->io_Length = sizeof(scsicmd);
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DoIO((struct IORequest *)scsi);
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if (scsicmd.scsi_Status != 0) {
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/* SCSI error — check sense data */
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}
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```
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---
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## References
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- NDK39: `devices/scsidisk.h`
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- ADCD 2.1: scsi.device autodocs
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