[time-nuts] HP 3458A ISOLATOR DTACK err @ pwr up

Mark Sims holrum at hotmail.com
Tue Jul 28 00:08:33 UTC 2009


I don't think that there were any user service manuals released on these meters.

DTACK is "data transfer acknowledge".  On Motorola processors it used to to control access to the bus.   DTACK is driven low by a bus device once it gets or sends the data.  Back in the old days a "DTACK grounded" system was one that ran without any wait states.  There was even a magazine by that name.

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