I want to use the Adaptec 1542C SCSI controller. What are the problems/tricks you need to know to get it working?
The first thing to check when trying to use the 1542C is the setting of ‘Enable Disconnection’ under the ‘SCSI Device Configuration’ menu. It should be set to YES for all devices, as the manual warns you. Matthias Urlichs (urlichs@smurf.ira.uka.de) has provided this description of the types of things that can cause problems for the controller and devices attached to it. The problem is that the Adaptec 1542C has (a) rather powerful line drivers, and (b) is sensitive to transient signals which can be induced by them via either a bad cable or a bad external terminator. A bad cable is almost any cable which doesn’t meet SCSI-2 specs. A bad external terminator is one which doesn’t adequately buffer its resistor network. So… – Remove the internal terminator from the last drive in your chain. Replace with an active SCSI-2 external terminator. Side improvement: active terminators consume a bit less power. – Check cables. Specifically, some cables carry less than the nominal 50 signal wires.
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