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The comparitor outputs are connected directly to the interface output
connectors J3 and J4. Through these connections the logic analyzer has a
direct connection to the SCSI Bus.
Parity check is accomplished with U3. U3 is tied to the data lines DBO
through DB7 and DBP (Parity). The output of U3 is run through parity
switch S2 so that this signal may be switched off when the SCSI Bus isn't
using parity.
The output of the parity device U3 goes high if odd parity is not met. A
high output is considered an error condition and is displayed on the logic
analyzer screen as a "* PARITY ERROR *" when S2 is turned on.
All of the SCSI Bus lines are connected to LED indicators to allow the
user to view the status condition of the SCSI Bus at a glance. These
LED's are driven with open collector buffers U2, U21, U22, and Ql.
Additional Information
A-6
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