Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!caen!hellgate.utah.edu!cc.usu.edu!slsw2
From: slsw2@cc.usu.edu
Newsgroups: comp.sys.dec
Subject: Re: RQDX[123] differences
Message-ID: <1991Jun25.162503.48223@cc.usu.edu>
Date: 25 Jun 91 22:25:03 GMT
References: <DERAADT.91Jun23205834@fsa.cpsc.ucalgary.ca>
Organization: Utah State University
Lines: 13

In article <DERAADT.91Jun23205834@fsa.cpsc.ucalgary.ca>, deraadt@cpsc.ucalgary.ca (Theo de Raadt) writes:
> Ok, so I see from some old postings that you can hook MFM disks up to
> RQDX3 controllers. What are the differences between these controllers
> (I mean, are they all MFM?).

RQDX1 and RQDX2 are almost identical. RQDX2 fixed some of the more obnoxious
bugs in RQDX1 (which was not originally intended to be a product, if the
rumors are correct) and allowed the controller to address disks larger than 32
MB. RQDX3 integrated the hard disk and floppy controllers using the SMC 9224
controller chip; the RQDX1 & 2 use a discrete hard disk controller.

Roger Ivie
slsw2@cc.usu.edu