> Date: Sun, 12 Oct 2003 12:32:26 -0500 > From: Jeff Walther <[EMAIL PROTECTED]> > Subject: Re: Internal SCSI drive connection > > >Date: Sat, 11 Oct 2003 13:43:23 -0700 > >From: David Klaus <[EMAIL PROTECTED]> > > >>I have a question regarding the PowerCenter Pro series of computers. > >>A friend of mine has one and it has a 2 GB SCSI drive. > >>What type of SCSI connection does this drive use? > > >This would be a 50 pin ribbon connector running at either 5MBps or 10MBps. > > Technically, the connector is an IDC connector which is too > disturbingly close to IDE for comfortable use--too much room for > confusion. But there's no relationship between IDC and IDE except > that IDE drives use a 40 pin IDC connector and SCSI drives use a 50 > pin IDC connector. > > On the PowerCenter Pro computer the internal (and external) SCSI is 5 > MB/s. It is unenhanced SCSI-2 which runs at 5 MB/s maximum and there > is only one bus, so the internal connector and the external connector > are on the same physical SCSI bus. > > Of all the Power Computing machines, only the Power 80/100/120 (NuBus > PowerMacs), the PowerWave and the PowerTower Pro have two SCSI busses > with the second, internal-only bus supporting 10 MB/s (Fast SCSI-2). > > The PowerCurve, PowerCenter, PowerTower, PowerCenter Pro and > PowerBase all have a single 5MB/s SCSI bus with both an internal and > an external connector. ================================= Actually, if it's a PowerCenter Pro, as originally installed, the 2 GB drive is either a Seagate or an IBM 'Narrow'(SCSI Fast) 50-pin drive capable of up to 20 MB/s, driven by either an Adaptec 2930 SCSI card or and Adaptec 2940UW card (both PCC OEM, but apparently fully equivalent to the retail versions.
The 2930 card has, I believe, both internal and external 50-pin connectors, while the 2940UW has both 50-pin and 68-pin internal connectors, and a 68-pin external connector - only TWO of which can be used at one time. And the 2940UW supports Fast/Wide SCSI (40 MB/s) on the 68-pin connectors. And, of course, there is a normal 5MB/s internal SCSI bus too. --------------------------------------------- This message was sent using Endymion MailMan. http://www.endymion.com/products/mailman/ -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.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/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
