Attach/Detach Packet (all devices)
| COMMAND | CONTROLLER |
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DEVICE | NAME | COMMAND | NOTES | |
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TAPE | Rewind | $01 | A rewind command is sent (2.0 | |
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| firmware and later) because | |
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| many tape devices require the | |
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| tape to be at BOT to send a | |
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| mode select command. | |
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| Reserve device | $16 | Executed on attach if reserve- | |
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| is set in packet. A reserve | |
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| device command is sent to the | |
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| controller. A reserve device | |
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| command can be used in a | |
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| ment to reserve the device. | |
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| Release device | $17 | Executed on detach if reserve- | |
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| is set in packet. A release | |
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| device command is sent to the | |
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| controller, and the firmware | |
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| clears an internal attach flag. A | |
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| release device command can be | |
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| used in a | |
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| environment to release the | |
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| device. | |
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| Mode select | $15 | This command configures the | |
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| controller for | |
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| parameters. | |
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| Test unit ready | $00 | Checks whether the selected | |
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| device is ready. | |
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An attach is required before any other commands may be sent to the SCSI firmware (except custom SCSI sequence or Bus Reset).
An attach call initializes the SCSI firmware pointers and internal flags. A RAM work area is used by SCSI firmware for building internal pointers and also contains the command sent to the SCSI controller. The RAM work area should not be reallocated until the device is detached or reset.
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