On Friday, February 04, 2005, at 12:03PM, Hal Meeks <[EMAIL PROTECTED]> wrote:
> Hi all, > > > I just installed a Jackhammer SCSI card (with version 3.2 control >panel) and connected the internal 50pin hard drive to it. It boots OK >with the internal drive but whenever I try to connect an external device I >get a sad Mac. Is this normal or have I not installed something properly? >Thanks! Try fiddling with the termination, both in the internal drive, the Jackhammer card and the external device. If the external device on the bus is not terminated or insufficient terminating power is supplied to the bus then the system will often suffer a bus error trying to access the SCSI. 50-pin drives *should* have an on-board terminator or facility to take terminating resistor packs. The board itself has a set of 3 1-line sockets behind the 68-pin connector that will take standard resistor packs also. I can't remember from memory (I'm several miles from my IIci!) if they use 8-pin or 10-pin packs... The external drive may have a switch on the back for it. Some do, some don't. Failing that you may need an in-line active terminator, or if it's an optical or MO drive it may have it on the internal drive mechanism. Terminating power is a bit more tricky. The card should supply enough for one device. This will not be sufficient if 2 devices are both terminating the different ends of the cable (AFAIK the 50-pin bus on the Jackhammer is shared between internal and external, with the 68-pin bus separate. It may only have one 68-pin bus with a fudge around to adapt the 50-pin stuff onto it, dunno for sure, perhaps someone could fill us in? If you get no results from shuffling the termination about look up the links for the hard disk and see if it has a link to enable termination power supplied 'from the drive'. -- Mark Benson http://homepage.mac.com/markbenson -- Vintage Macs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Vintage Macs list info: <http://lowendmac.com/lists/vintagemacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[email protected]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/> iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
