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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: mazatta on February 08, 2006, 06:05:01 AM
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Hi there, just curious what all one must look for when looking to add SCSI devices (in this case, to an A2000)? I have recently purchased an AdSCSI 2000 and have an assortment of SCSI hard drives laying around that I could hopefully use with it. I am also interested in using the external port on that card to possibly hookup an external cdrom (I'm assuming this card only supports one device internally?), but again I do not know exactly what to look for. I've tried looking, but have yet to find anything to lead me down the right path, so any help is appreciated!
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The AdSCSI 2000 supports more than one internal drive, up to 6 drives iirc (or some combination of internal/external units no greater than 6). You need a 50-pin scsi ribbon cable with multiple connectors to attach more than just a harddrive. With scsi chains, termination of the last drive is key. Make sure you have set the jumper on the last drive only for termination. On an A2000, this usually is a cdrom drive in the 5.25" bay (or so on all the machines I've set up). Occasionally you need to put a passive terminator on the cable beyond the last drive for fussy controllers. The AdSCSI is a pretty simple controller, so just setting the jumper on the last drive should be okay. You should know that AdSCSI is a polled scsi card (i.e. it doesn't do DMA transfers), so performance isn't that great and ties up the cpu (on a par with old ide). You can use the DB25 external connector for external drives, again just make sure you properly terminate that end of the chain. You'll need a DB25 to Centronics external scsi cable(s).