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Pat LaVarre wrote:
This message is from the T13 list server.
First exception that leaps to my mind is what the host experiences when DEV was 1 when the op x90 EXEC DEV DIAG hit the bus and there is no ID = 0 device and the system in question pulls both INTRQ and BSY hi ...
A properly implemented PATA`host has a PULL DOWN on the DD7 signal - the host sofware does not see BSY=1 in your example. BTW the host could pull INTRQ either way - a missing device does not automatically mean INTRQ will go high if there is no device driving the signal.
Hale
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++ Hale Landis ++ www.ata-atapi.com ++
