Gary, So your drive is a 68-pin drive and you've got it hooked to a 50-pin cable? That is what I need. Where could I find such a beast? Are they sold new by any place that you know of? Or is it something I'm likely to find on Ebay? - Bob -----Original Message----- From: cctalk-admin(a)classiccmp.org [mailto:cctalk-admin@classiccmp.org] On Behalf Of Gary Hildebrand Sent: Sunday, June 09, 2002 12:47 AM To: cctalk(a)classiccmp.org Subject: Re: 50 & 68 pin SCSI-2 Bob Lafleur wrote: Yep, I have a 68 pin to 50 pin adapter on a drive on my Amiga. 68 pin is SCSI-3 and is 16 bits per transfer cycle rather than 8. There are 50 to 68 pin adapters, but the termination for half the buss is a rare animal. I'd just have everything unterminated, and have a good active term on the end of the 68 pin cable. The down side is everything is slowed to SCSI-2 standards. I want to find a SCSI-3 CDrom to avoid that if possible, as I just bought a SCSI-3 hd for my Linux box here. I want to integrate a small SCSI-2 drive as my /swap partition. Gary Hildebrand St. Joseph, MO

An even better trick than this is to use 80-pin SCA SCSI drives. Computergeeks.com sold (maybe still sells) a PCB that adapts this to either 68 pin _or_ 50 pin SCSI for maybe 10 bucks. You can pick up SCA 80-pin drives very, very cheap or free, even new ones, because most people figure the interface to be "proprietary" and the drives are very hard to sell. --- Gary Hildebrand <ghldbrd(a)ccp.com> wrote: __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com

----- Original Message ----- From: "Gary Hildebrand" <ghldbrd(a)ccp.com> To: <cctalk(a)classiccmp.org> Sent: Sunday, June 09, 2002 12:46 AM Subject: Re: 50 & 68 pin SCSI-2 I picked up a 50-pin-cable-to-68-pin-device from the local Microcenter a while back. It's marked `ACTIVE' for some reason. Does the high byte on a device need to be terminated too? I believe Microcenter is a mailorder outfit, they might have a comprehensive catalog somewhere. If there's a store local to you, it might be a fun place to visit. Mostly expen$ive, but the place here was pretty poorly managed, and some good deals could be found where the computer spit out an obviously wrong price. (It goes both ways though-- I pointed out a drive pigtail IIRC that was marked $49.95. The salescritter said it had to be the right price. YMMV) Bob

Dick, Thanks for the info. I'll look into these adapters your talking about. The specific wide drives I have that I'd like to connect to the narrow bus are RZ29's. So I'll have to see what I can find out about configuring them for narrow bus. - Bob -----Original Message----- From: cctalk-admin(a)classiccmp.org [mailto:cctalk-admin@classiccmp.org] On Behalf Of Richard Erlacher Sent: Sunday, June 09, 2002 10:06 AM To: cctalk(a)classiccmp.org Subject: Re: 50 & 68 pin SCSI-2 You're right, of course, but it's also possible to configure your wide SCSI devices to work on a narrow controller. I have that configuration working with SCA devices, which make it somewhat easier (at least less costly) but it's necessary that you consult the documentation for your wide drives to see about configuration details. The drives (several types) that I have all allow for "narrow" configuration with a single jumper. That's necessary, but not sufficient, since you also need the adapter cable, or an adapter board. If you configure the drive for narrow transfers, I doubt it matters whether you terminate the upper part of the bus appropriately, but if you have the option, I'd terminate the upper bus anyway. If you don't have an adapter and can't find one that's cheap enough, you could use one of the 3-way adapters that abound on the web for attaching SCA drives to a WIDE controller or a Narrow controller. There are at least three types, and what you want is the one that has BOTH the wide and narrow connectors. You're not required to use the SCA connector, though that's how the boards are intended to be used, and can then connect both a WIDE cable and a NARROW cable to the board, presumably with the NARROW cable going to your controller. I've done this with complete success, so you should have no trouble. Dick ----- Original Message ----- From: "Bob Lafleur" <bob_lafleur(a)technologist.com> To: <cctalk(a)classiccmp.org> Sent: Saturday, June 08, 2002 10:18 PM Subject: 50 & 68 pin SCSI-2

devices on an Adaptec 2940UW card, using separate 50 & 68 pin cables? I'd like to do that, but then I'd have another big ribbon cable taking up room in my PC here. I've run a SCSI-3 hard drive on the wide internal connector, and SCSI-2 CD-ROM and tape drive on the internal 50-pin connector of the 2940UW. Works fine. When you're doing that though, you can't use the external connector on tbe back. With a 2940UW-PRO, you can use all 3 connectors at once, which I have also done. - Bob

3 ways are great for SCSI 1,2 & 3, but remember, you MUST have one that is labeled LVD or it won't work right with Ultra2 (80) or Ultra3 (160) SCSI (different setup slightly). I get one too many customers not realizing this when they pick one up at the store I work at ("Oh, it's that 68 pin thing, that's all it really is, I don't need that LV-something thing." - later turning out to be Ultra2 or 3). -John Boffemmyer IV At 10:05 AM 6/9/02, you wrote: ---------------------------------------- Founder, Lead Writer, Tech Analyst and Web Designer Boff-Net Technologies http://boff-net.dhs.org/index.html ---------------------------------------

The RZ29's I have came out of StorageWorks boxes. I'm assuming it's a standard RZ29 in those boxes. I figured though since RZ26L and RZ28 are 50-pin that a RZ29 would be 50 pin also. Big surprise to see it's a 68-pin drive! On the drive it says RZ29B-W... Guess the W means "Wide". Is there just a standard RZ29 that is SCSI-2 50-pin? -----Original Message----- From: cctalk-admin(a)classiccmp.org [mailto:cctalk-admin@classiccmp.org] On Behalf Of Jerome H. Fine Sent: Sunday, June 09, 2002 5:49 PM To: cctalk(a)classiccmp.org Subject: Re: 50 & 68 pin SCSI-2 Jerome Fine replies: I can't help you with the RZ29. I use only the RZ28. I normally get my RZ28 drives by opening an RZ28D-VA box. If you can use them, they convert the RZ28 (which is just an ST32550N drive from Seagate) into the 68 pin interface. I can use a few more, so contact me off list if you want to arrange for me to buy some RZ28D-VA boxes which contain the ST32550N drives. Normally, I buy about 10 at a time. They are quite useful to run RT-11 when attached to a host adapter either on a PC (PCI Adaptec AHA-2940AU) or on a real PDP-11 (Qbus CQD 220/TM). Each RZ28 can hold almost 31 RT-11 partitions. Under Ersatz-11 on a PC, each ST32550N drive can have its own device driver under RT-11 EVEN though it is connected to the same SCSI host adapter. Sincerely yours, Jerome Fine -- If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.