[net.micro] H37 inside H89 response to query

MITCHW@Mit-Mc@sri-unix (11/22/82)

From: MITCHW at Mit-Mc (Mitch Wolrich)
	Date: 21 Nov 1982 1743-EST
	From: John S Labovitz <RMS.G.HNIJ.MIT-OZ@Mit-Mc>
	Subject: H37 inside H89

	Has anyone tried putting the soft-sectored drive inside the H89 cabinet
	(where the hard sectored one usually is)?  In the manual, it says the
	power supply would cause too much interference for the drive to operate.

			Thanx,

			John Labovitz
			(RMS.G.HNIJ@MIT-OZ)

Its not that the power supply cause's too much interference, its that the
CRT noise, generates enough RF crap to interfere with reliably writing on
80 track double sided drives (the noise margin is very low)..  If you put
a MU metal shield around the drives (as Zenith is doing now..) everything works
fine.  Incidently, I am using a Z90-82 with built in 40 track ss drive, with
no problems.  Mitch.