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- From: youngqd@atlantis.CS.ORST.EDU (Dean Youngquist)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: RLL & IDE
- Message-ID: <1992Aug31.063719.4636@leela.cs.orst.edu>
- Date: 31 Aug 92 06:37:19 GMT
- Article-I.D.: leela.1992Aug31.063719.4636
- References: <l97on8INNqv9@aludra.usc.edu> <1992Aug26.174720.23824@unislc.uucp>
- Sender: usenet@leela.cs.orst.edu (Usenet programs owner)
- Organization: Computer Science Outreach Services - Oregon State University
- Lines: 39
- Nntp-Posting-Host: atlantis.cs.orst.edu
-
- >*** N.T.K.C.D. *** (hho@usc.edu) wrote:
- > My system has 2 RLL drives with a controller..
- > My question is, IT it possible at all the add another RLL
- > , MRM or IDE card to control 2 more drives???
- >
- > I know SCSI can, but I want to buy OLD/USED cheap RLL,
- > MFM, or IDE for storage for My BBS only
-
- I have had up to 4 RLL drives in my AT. The key is that one of the RLL
- controller cards must switchable to another set of controll addresses.
- Also, the bios ROM address on the card should be switchable to another
- location. This will avoid bus contention. I am using Seagate ST22R
- controller and it works. ST21M, ST21R, ST22M, ST22R all can move the
- BIOS or disable it. the 22 number means has floppy controller on board,
- and the M means MFM while the R is RLL. It comes with a nice manual
- explaining how and when do move and disable the BIOS on the card.
- Only problem so far it does not like 386SX boards but works fine
- with 386DX and 286 machines. So if you have one controller in there
- already, either MFM or RLL you could add 2 more drives by getting
- one of these controllers. Actually I think it might work with an
- existing IDE controller as long as you could be sure the addresses of
- ROM and controll do not conflict between the IDE and RLL controller cards.
-
- The ROM on the card I have can go to 4 addresses,
- C8000 TO CBFFF
- CC000 TO CFFFF
- D8000 TO DBFFF
- DC000 TO DFFFF
-
- HArd Drive I/O port choices are:
- 1F0 TO 1F7 along with 3F6 to 3F7
- 170 to 177 along with 376 - 377
-
- Floppy controll I/O ports can be:
-
- 3F0 - 3F5 3F7
- 370 - 375 377
-
- Dean
-