Path: news1.icaen!news.uiowa.edu!iagnet.net!iagnet.net!NewsNG.Chicago.Qual.Net!Qual.Net!ais.net!nntprelay.mathworks.com!intgwlon.nntp.telstra.net!news.telstra.net.nz!news.wlg.netlink.net.nz!news.actrix.gen.nz!dempson From: dempson@actrix.gen.nz (David Empson) Newsgroups: comp.sys.apple2 Subject: Re: Please ID SCSI Card Date: Thu, 11 Jun 1998 02:49:17 +1200 Organization: Empsoft Lines: 42 Message-ID: <1dafrmm.16n06uu1xrrt2dN@dempson.actrix.gen.nz> References: <3354447707.1692028@snac.mv.com> NNTP-Posting-Host: news2.actrix.gen.nz X-Newsreader: MacSOUP 2.3 Xref: news1.icaen comp.sys.apple2:135126 Al Boisvert wrote: > Hi, > > I'm using an Apple SCSI card in my IIGS. How can I tell if it's a High-Speed > SCSI or Rev.B, Rev.C, or whatever? One way to tell is the date on the circuit board: the original card was made in 1986, the high-speed card in 1990. (You said '90, so you have the high-speed card.) Once you have seen both cards, it is very easy to tell them apart. The most noticeable features: - The original card's SCSI chip (the largest one on the board) is a traditional 40-pin rectangular DIP, and it is an NCR5380. - The high-speed card's SCSI chip is a 44-pin square pack chip (PLCC) in a brown socket, and is an NCR53C80 (the 'C' indicates it is the CMOS version). There is a similar looking square pack chip in a socket right beside it. - The original card has a row of eight jumpers to set the SCSI ID. - The high-speed card has a four position DIP switch to set the SCSI ID (and DMA enable). To tell the difference between ROM releases on the original card, look at the part number. 341-0112A Revision A 341-0112B Revision B 341-0437-A Revision C My original card started with revision A (I still have the original EPROM), and I upgraded directly to revision C. I've never had a close look at revision B, so I'm not entire sure how the suffix is written: it might be "-B". -- David Empson dempson@actrix.gen.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand