goldfarb.ucf-cs@rand-relay.arpa (02/03/83)
From: Ben Goldfarb <goldfarb.ucf-cs@rand-relay.arpa>
Regarding floppy disk drive A/C motor controllers, the questions to
be answered are:
o Must one build in a software delay to allow
motors to ramp up to speed? Obviously, this
is necessary and it may slow things down
too much to be tolerable for normal operation.
o How does the software know whether the motors
are spinning or not? If the software doesn't
know, the delay for motor ramp up has to be
built into ALL accesses.
Remember the TANSTAAFL Principle (There Ain't No Such Thing As A Free Lunch).RROTH.ES@parc-maxc.arpa (02/04/83)
Ben, You are allowed 10 retries on a read/write attempt. With the motors just starting to spin you'll get errors, but you will be up to speed within the 10 and then off and running. I know that it is not a clean approach but it has two things in its favor: 1. It is cheap 2. It works Bob