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- Path: diku.dk!maze
- From: maze@diku.dk (Mads Haahr)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: SCSI Examples
- Date: 31 Jan 1996 15:42:44 GMT
- Organization: Department of Computer Science, U of Copenhagen
- Sender: maze@embla.diku.dk
- Message-ID: <4eo2lk$eae@odin.diku.dk>
- References: <4edl8o$49v@rapidnet.com>
- NNTP-Posting-Host: odin.diku.dk
- X-Newsreader: NN version 6.5.0 #13
-
- wblock@rapidnet.com (Warren Block) writes:
-
- > Example 3: 2091 controller, internal 200M SCSI-1 hard drive, internal 540M
- > Fast SCSI-2 hard drive, external SCSI-2 CD-ROM drive. The cable
- > from the CD-ROM drive to the A2091 is a Centronics 50-pin to
- > DB25 adapter cable, and the internal cables are 50-conductor
- > ribbon. An active terminator is attached to the last available
- > external SCSI connector on the CD-ROM drive. Note that the
- > terminating resistors on the A2091 have been removed so that the
- > SCSI bus is terminated only at the ends (the CD-ROM and the 540M
- > drive).
- > ________________
- > | CD-ROM SCSI-2 |
- > | Terminated |---. External cable connected to A2091
- > | Address 4 | | external SCSI DB25 connector
- > |________________| |
- > External |
- > |
- > ____________|___ ________________ _______________
- > | 2091 | | 200M SCSI-1 | |540 Fast SCSI-2|
- > | Not Terminated |------| Not Terminated |------| Terminated |
- > | Address 7 | | Address 1 | | Address 0 |
- > |________________| |________________| |_______________|
-
- Strange. The A2091 manual doesn't say anything about removing the
- controller terminator. It says to terminate the last internal and
- external SCSI devices, if you have both kinds, but nothing about
- removing the controller terminator (which is soldered in place, BTW).
-
- I admit that I *was* puzzled when I first read the A2091 manual, but I
- now I have one internal SCSI-1 drive and one external FAST SCSI-2
- drive (both terminated, as is my A2091) and this works well. But of
- course I may just be lucky.
- --
- Mads Haahr (maze@diku.dk), | The right to arm bears
- Department of Computer Science, | is the right to be free.
- University of Copenhagen |
-