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From: tjt@kobold.UUCP (T.J.Teixeira)
Newsgroups: net.micro.6809
Subject: Re: Radio Shack Floppy Disk Interface
Message-ID: <230@kobold.UUCP>
Date: Tue, 3-Jan-84 14:35:32 EST
Article-I.D.: kobold.230
Posted: Tue Jan  3 14:35:32 1984
Date-Received: Wed, 4-Jan-84 04:58:24 EST
References: <428@bbncca.ARPA>
Organization: Masscomp, Westford, MA
Lines: 10

I believe Zenith/Heathkit uses a similar technique (i.e. halting the
CPU between each data byte transferred) for their soft-sectored floppy
controllers (H-37) for the H-89, at least for double-density.  The
latency requirements are so tight that there is not even time to read a
ready flag from a device register, let alone handle an interrupt.  I
believe that for single-density, the H-89/H37 is able to read a status
register.
-- 
	Tom Teixeira,  Massachusetts Computer Corporation.  Westford MA
	...!{ihnp4,harpo,decvax,ucbcad,tektronix}!masscomp!tjt   (617) 692-6200