Path: utzoo!attcan!uunet!wucs1!wuibc!gmat From: gmat@wuibc.UUCP (Gregory Martin Amaya Tormo) Newsgroups: comp.sys.ibm.pc Subject: Re: Disk Controller Question Message-ID: <341@wuibc.UUCP> Date: 2 Dec 88 02:18:38 GMT References: <1226@dutesta.UUCP> Reply-To: gmat@wuibc.UUCP (Gregory Martin Amaya Tormo) Organization: Washington University in St. Louis Lines: 52 >My system (XT-clone) already contained a 20 Meg harddisk and a >controller with MFM encoding. >The harddisk is a Microscience HH-725B, the controller is a National >Computer Limited (NCL) NDC5127-50. >Because the first disk is an RLL disk and the other an MFM, I need to have >both controllers in my system. >The RLL controller is configured to have its BIOS at D8000, >the MFM controller has its BIOS at C8000. > >Now here are the questions: > > - Does anyone out there know why these controllers > don't work together? I will guess that the IO address do conflict, even if the BIOSs load at different positions. > Is it possible to make them do so? You will need to find out how to change the IO addresses on one or the other cards without conflicting with any other IO devices > - I don't have any documentation on the Microscience disk > nor the NCL controller. You will need to get it. > Is there anyone who has? You should be able to call the respective companies' tech support lines. They should give out the information for free, since there is no labor or parts involved. > - Is it possible to use the Microscience disk (which has a ST-506/ST-412 > interface) on the RLL controller? > The ST-238R disk also has a ST-412 interface. This I do not know, but I doubt it. The 30MB hard disk is actually the same physical disk as the 20MB. But the encoding method RLL vs MFM allows more data to be stored on RLL classified hard disks. > Thanks in advance, > Paul. Hope it helps. David Deitch, Computer Connection dwd0238@wucec3.wustl.bitnet Fido 1:100/22 ( Please mail to me, do not reply )