Path: utzoo!attcan!uunet!cbmvax!joe From: joe@cbmvax.UUCP (Joe O'Hara) Newsgroups: comp.sys.amiga Subject: Re: A2090(A) J5 LED jumper Keywords: should it work ? Message-ID: <5286@cbmvax.UUCP> Date: 21 Nov 88 21:58:20 GMT References: <6834@watcgl.waterloo.edu> Reply-To: joe@cbmvax.UUCP (Joe O'Hara) Distribution: comp Organization: Commodore Technology, West Chester, PA Lines: 36 In article <6834@watcgl.waterloo.edu> grwalter@watcgl.waterloo.edu (Fred Walter) writes: >I was switching drives around (upgrading from to a Miniscribe 8051S) and I >tried connecting the hard disk led on my 2000 to the J5 jumper on my 2090A, >as suggested in the manual. When the connector is put on one way, the led >is on all the time (even when I don't have the hard disk connected); when >the connector is reversed it is never on. > >I thought the led should go on whenever the harddisk is accessed, and stay >off otherwise. Am I right in thinking this ? > >I mentioned this to the dealer where I bought the card (it is still under >warrentee) and he said "don't use the J5 jumper". Ya, right. If something >is wrong with the card I figure to get it fixed under warrentee. The J5 jumper is for connecting the LED of an ST-506 hard disk. Use J4 for SCSI drives. > >As a side note, while the Miniscribe 8051S is 'supported' by the A2090A and >the version of PREP I have (it is in the list that prep gives me) the >number of cylinders PREP thinks the 8051S has is 964, which is wrong. The >guy I got the drive from tells me that it has only 739 usable. I have prep >version 33.34. The logical geometry used for a Minscribe 8051S is different from the physical geometry of the drive. This is so because of the way the drive reserves spare blocks (it reserves sector 0, surface 0 of each track). The logical geometry used in PREP was supplied to us from Miniscribe: 965 cylinders; 5 surfaces; 17 blocks/track. -- ======================================================================== Joe O'Hara || Comments represent my own opinions, Commodore Electronics Ltd || not my employers. Any similarity to Software QA || to any other opinions, living or dead, || is purely coincidental. ========================================================================