See the ncrs 7D man page. Previous revisions were pre-release versions of the chip, so there might still be a few in circulation. It also provides generic SCSI features such as tagged command queueing and auto-request sense. Thus, in this case, the sym driver will attach all 53C8XX based controllers present in the system. In these instances, the system recovers and the tape drive remains usable. 
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Previous revisions were 533c810a versions of 53c810aa chip, so there might still be a few in circulation. See the ncrs 7D man page. Do not attempt to connect wide targets to the narrow connector of the cards listed as supporting narrow disks. BUGS No known bugs. If the DOS partition isn’t created, the system won’t reboot after Solaris installation. These values can be increased by changing appropriate constants in driver header files not recommended.
These numbers are not so much limited by design as they are considered reasonable values for current SCSI technology. Such a system cannot be used with Solaris software.
Download NCR/Symbios/LSI Logic 53C PCI SCSI host adapter – MajorGeeks
The sym53c8xx driver is derived from the ncr53c8xx driver, which was ported from olgic FreeBSD ncr 4 driver to Linux Thus, in this case, the sym driver will attach all 53C8XX based controllers present in the system. The ncrs driver supports at least Revision 4 of the 53C chipset. You can still use the tar command to add or extract files to or from the tape in the drive.
On some early PCI systems with the 53C chip on the motherboard, the interrupt pin on the chip is not connected. Only HVD implementations that conform with Symbios Logic recommendations can be detected by the driver.
PCI Hardware Supported by NetBSD
By default the driver only supports HVD for these chips. It also provides generic SCSI features such as tagged command queueing and auto-request sense. It also pogic the advantage of architectural improvements available only with newer chips. These configurations are not supported.
On some Pentium motherboards Intel NX chipset using P90 or slower processors, ncrs hangs and this message is displayed on the console: This driver offers other options that are not currently exported to the user. Changing these options is not recommended unless absolutely necessary. Driver features include support for wide SCSI busses and fast10, fast20, fast40 and fastdt synchronous data transfers depending on controller capabilities.
You can suppress these warnings by disabling tagged queuing in the ncrs. In these instances, the system recovers and the tape drive remains usable.
Upgrading the motherboard BIOS, the add-in card, or both may prevent these conflicts. This option is supplied for convenience but it is neither recommended nor supported. By default, when both the ncr 4 and sym drivers are configured, the sym driver takes precedence over the ncr 4 driver. Some of these options are planned to be exported through sysctl 3 or an equivalent mechanism in a future driver releases and therefore, no logiv is guaranteed.
This feature allows the driver to safely probe against bus mode and to set up the chip accordingly. On some Pentium motherboards Intel NX chipset using 53c81a or slower processors, ncrs hangs and this message is displayed on the console:.
Create at least a 1-cylinder DOS partition starting at cylinder 0. This driver is configured by default for a maximum of outstanding commands per bus, 8 LUNs per target and 64 tagged tasks per LUN.
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