On Mon, 3 Apr 2000, Matthew Dharm wrote:
>For reference, I'm not using newer drives. This is all second-hand
>equipment.
uh huh...
>Basically, tho, none of the drives work. The diagnostics for the DAC960PD
>indicate a "cable error" that has to do with parity. This only occurs
Are the drives jumpered for parity? If they aren't jumpered, they may not
even calculate parity.
>with a device plugged in. No combinations of just cables and terminators
>will cause this to happen.
Pardon my "attitude", but _duh_. If there's nothing to talk to, where's
it supposed to get a parity error? The terminator is just a bunch of
resistors. Here's how this works... the initiator (scsi card) sends a
command and data to the target (drive). The target calculates parity
for what it received and checks it against what it should see. If it
detects a parity error, it signals an error to the initiator (check condition
with sense data indicating a parity error.) The initiator does the same
check in receiving data back from the target. The parity information is
"out of band". It's in parallel to the data on the bus -- 8bit data, 1bit
parity -- and thus can be processed "on the fly".
It's alot to read, but the SCSI specs are available on-line, free of charge.
--Ricky
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