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Author Topic: A4000 tower...help!  (Read 5325 times)

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Offline darksun9210

Re: A4000 tower...help!
« on: March 13, 2004, 09:52:23 PM »
yeah as standard the scsi controller on the A4000 isn't auto terminating, so setting the switch on the back to "no external scsi devices" will terminate the bus at the controller. if your drive doesn't offer termination (assuming for previous posts that you do only have one SCSI device) then on the IO board on the back of the A4000T case that carries the mouse/joystick/parrallel/serial ports, there should be an unused 50pin socket. this is actaully a passive scsi terminator, so if your ribbon reaches, switch off the termination of the drive and plug the end of the cable into this.

also, another idea, switch your scsi bus to "slow scsi" mode and try playing with the Async/sync switc too. see if this clears anything up.

i had a set of quantum fireball drives that loved fast/syncronous scsi, but as soon as i put a seagate barracuda drive on there, i had all sorts of problems till i switched the bus to asyncronous.

btw, got a couple of scsi cdroms and DDS2 tape drives here that i have no use for.. anyone interested?

A500, A600, A1200x3, A2000, A3000, A4000 & a CD32.
and probably just like the rest of you, crates full of related "treasure" for the above XD
 

Offline darksun9210

Re: A4000 tower...help!
« Reply #1 on: March 16, 2004, 08:27:08 AM »
hmmm, ok
are you using the scsi cable that came with the machine? might be worth getting hold of another one. mine was all folded up when i got it and might have had a couple of internal lines broken... seemed to work when straightened, but other than that, it didn't... anyway, i replaced that with another cable, and took the headers off the cable to use on another new cable for all my devices.

and one of the things i remember was that swtiching the dip switches to "on" switched off the functions. most irritating. one other thing to consider, (and boosted my scsi speed) was switching off the termination, and putting an [active] scsi terminator on the scsi port on the back. other than that, its just make sure that none of your devices have termination enabled apart from the last one(s) on the chain, but i guess i'm pointing out the obvious there ;) (scsi controller counts as a device)

oh and if anyone does seriously want a Scsi CDrom or DDS2 tape drive, send me an email, and if you're in the UK i'll ship it free, outside the UK and i guess the postage'll cost more than a new drive! two of each, and they're just sitting on a shelf not doing anything...

oh crap, just thought. it might be worth one of your devices suppling "term power" to the bus (should be a jumper for it on one of your drives) this would enable the proper termination if you are using an active terminator.

A500, A600, A1200x3, A2000, A3000, A4000 & a CD32.
and probably just like the rest of you, crates full of related "treasure" for the above XD