Tekram Technology DC-820B manual Ide

EISA Fast SCSI Caching Adapter

F:, and so on. The following demonstrates the case of one IDE adapter with two IDE HDD drives and two DC-820Bs with seven SCSI drives. Also, refer to the I/O port definition for more scanning details.

IDE	DC-820B	DC-820B
	(I/O port 330H)	(I/O port 230H)

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C:	E: (SCSI ID 1)	G: (SCSI ID 2)
D:	F: (SCSI ID 4)	H: (SCSI ID 3)
		I: (SCSI ID 4)
		J: (SCSI ID 5)
		* (SCSI ID 6)

*: Unrecognized. This is the last device in the scanning sequence and is beyond the maximum of eight devices. Need device driver.

If any device(s) among E: through J: is a removable medium, you still have a chance to access the unrecognized drive, which is over the limit of the maximum eight devices. Let’s say that drive F: is an MO device. You can then set the BIOS INT 13H device option as HD (refer to the next subsection for more details). In this way, the DC-820B’s BIOS INT 13H won’t sense its existence and the new eight devices’ scanning sequence would be re- arranged as follows:

IDE	DC-820B	DC-820B
	(I/O port 330h)	(I/O port 230h)

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C:	E: (SCSI ID 1)	F: (SCSI ID 2)
D:	* (SCSI ID 4)	G: (SCSI ID 3)
		H: (SCSI ID 4)
		I: (SCSI ID 5)
		J: (SCSI ID 6)

*: This Unrecognized device can be accessed if controlled through a device driver.

It is required to enable this option in order to work with drive capacity over 1GB under DOS environment. Refer to MAX DOS disk Capacity in

the next sub-section.

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