Appendix C General Troubleshooting Tips | Tekram Technology DC-820B

EISA Fast SCSI Caching Adapter

Appendix C:

General Troubleshooting Tips

Most controller errors are traceable to external factors, such as conflicts with other installed cards, bad or incorrectly configured drives, loose cables, or other installation errors. A device list concerning the limitations, such as cannot work with 10MB/sec SCSI synchronous transfer rate, or prob- lems caused by the devices themselves can be found in the DEVICE.LST file.

Please also note the DOS 5 support feature in your DC-820B. Your system is able to control up to eight drives through BIOS INT 13H without adding device drivers. If more than two SCSI drives (and not running under DOS 5.0), more than one adapter, or other SCSI devices need to be installed, such as removable media, tape, or CD-ROM, you should install the device drivers.

When trouble occurs in your system, you can always try to verify the possible causes by changing various components in your system, such as I/O card, DRAM SIMM, CPU, or motherboard. Also I/O port conflicts happen frequently when multiple I/O cards are installed. The following are general guidelines for some specific error conditions:

0.The LED connected to JP1 flashes some diagnostics signals after power up. The following shows the flash frequency of each fatal error condi- tion:

n One short flash: DC-820B’s CPU error

n Two short flashes: SCSI chip error

n Three short flashes: BMIC (82355) error

n Four short flashes: DC-820B’s SRAM error

n Five short flashes: DC-820B’s EPROM checksum error

1.Under BIOS INT 13H (not more than two hard disk drives installed for Non-DOS 5 support environment):

n if the SCSI ID set properly (ID=0 for the first drive and ID=1 for the second drive) and the I/O port set to 330H