Amiga.org

Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: oddmario on March 11, 2006, 07:21:10 AM

Title: 80 to 68 scsi
Post by: oddmario on March 11, 2006, 07:21:10 AM

Just got hold of 2 Seagate st34555w 4,3GB harddisk.
I am trying to find some cables that enables me to use them with my A4000 with 80pin scsi and these are 68pins.
Tryed all my usual outlets witn no luck.
All info is helpful.

Title: Re: 80 to 68 scsi
Post by: motrucker on March 11, 2006, 02:00:29 PM

This is THE place to find cables, or adapters for cables.
http://www.redmondcable.com/dynamicdata/shop/shopdisplayproducts.asp?id=5&cat=SCSI+Adapters
Hope this helps you.

Title: Re: 80 to 68 scsi
Post by: pVC on March 11, 2006, 02:02:27 PM

Are you sure you have 80 pin connector there?-) I'd think on A4k there may be 50pin connector on mobo (T) or older accelerator... or 68 pin on newer accelerator like some Cyberstorms. Google with scsi and you'll probably find some cables/adapters :) I've also found 50/68 adapters from old server trash ;)

Title: Re: 80 to 68 scsi
Post by: Zac67 on March 11, 2006, 05:14:37 PM

80 pin (SCA) is only used on hard drives for enclosures, never on HBAs. http://en.wikipedia.org/wiki/SCSI_connector (http://en.wikipedia.org/wiki/SCSI_connector) and its links shows all SCSI connectors in use.

Title: Re: 80 to 68 scsi
Post by: oddmario on March 12, 2006, 02:08:50 AM

Thanx everyone

Problem solved.

Title: Re: 80 to 68 scsi
Post by: motrucker on March 15, 2006, 05:03:49 AM

Isn't it an old Chinese saying to Not believe eveything that's written? It holds true in this case. There are several SCSI type ports missing........

Quote

Zac67 wrote:
80 pin (SCA) is only used on hard drives for enclosures, never on HBAs. http://en.wikipedia.org/wiki/SCSI_connector (http://en.wikipedia.org/wiki/SCSI_connector) and its links shows all SCSI connectors in use.

Title: Re: 80 to 68 scsi
Post by: Olecranon on March 16, 2006, 01:52:19 AM

Those 80pin SCA to 50pin adapters work pretty well.  My A2000 is running a 10K RPM SEAGATE ST34502LC  
cheetah 4GB hard drive that I bought new on ebay for $8.00

Even though the data transfer speed nowhere near what the drive can handle, the fast access speed make the system feel fast.

Title: Re: 80 to 68 scsi
Post by: QuikSanz on March 16, 2006, 02:54:19 AM

Hi Olecranon,

Just got a new 80 pin 10k rpm for my A4000T and it is not recognised in HDToolbox.
Maybe I'll just try hooking it direct to my Cyberstorm with no adapter and see what happens.

Chris

Title: Re: 80 to 68 scsi
Post by: Kin-Hell on March 16, 2006, 03:52:06 AM

Quote

QuikSanz wrote:
Hi Olecranon,

Just got a new 80 pin 10k rpm for my A4000T and it is not recognised in HDToolbox.
Maybe I'll just try hooking it direct to my Cyberstorm with no adapter and see what happens.

Chris

You need to change the tooltype on the HD Toolbox Icon if you are running OS earlier than 3.9
Also, if your Cyberstorm is a MkII, you will require the SCSI adapter module for this card to connect SCSI devices. The CS MkII is a faster interface than the A4000's. If you have as CS MkIII, there is a 68 Pin SCSI III header right on the card. Be sure to terminate the SCSI cable with an Active Terminator if running more than 1 SCSI Device, otherwise, Enable Termination on the SCSI Hard drive itself. If you ever put more than 1 hard drive on the SCSI Bus, you will certainly have to fit an Active SCSI Terminator to the end of the SCSI cable. On some occasions & this all depends on the type of SCSI devices you have on the Bus, you might have to terminate Both ends of the SCSI cable with Active Terminators. As a final word on performance, try to avoid putting CDROM's, ZIP drives etc on the SAME SCSI bus as your Hard drives. It will affect your Hard drives speed. As you have the 4000T, slap CDROM's, Zip drives, scanners etc onto the A4000's onboard SCSI and then your Hard drive(s) on the CS.
Another thing just popping into mind is Soft Kicking ROM Images into Ram on A4000T's. Be sure the ROM Image is the 40.70 image & not the 40.68. The latter was for the desktop 4000's & does not include the SCSI info required by 4000T's.
Best of luck bud! :-)
 
*edit* When using multiple SCSI devices, be sure ALL the devices before the Active SCSI cable Terminator are set with no termination, otherwise you will Terminate the SCSI bus prematurely and not see all your devices

Title: Re: 80 to 68 scsi
Post by: QuikSanz on March 17, 2006, 12:11:30 AM

Hi Kin-Hell,

I do have OS3.9 and have never had a problem with it recognising hard drives on the stock SCSI.device. I have nothing on the CS MK3 SCSI right now but I may switch around cause what you say about speed does make sense. However if the drive is not being recognised it's going to be a long road.

Chris

Title: Re: 80 to 68 scsi
Post by: stopthegop on March 18, 2006, 12:05:24 AM

"As a final word on performance, try to avoid putting CDROM's, ZIP drives etc on the SAME SCSI bus as your Hard drives. It will affect your Hard drives speed. As you have the 4000T, slap CDROM's, Zip drives, scanners etc onto the A4000's onboard SCSI and then your Hard drive(s) on the CS."


Wise advice, but I think you meant to say onboard IDE bus, not onboard SCSI...  As the A4000 has no built in SCSI bus.  Hook the SCSI Hard Drives up to the cstorm as mentioned and terminate BOTH ends of the bus with ACTIVE termination!  DO NOT (REPEAT, DO NOT) use "termpwr" or any other built-in scsi termination on ANY scsi device for termination of the cyberstorm SCSI bus!  You must have a 4 position SCSI II/III 68pin passthru cable to use the cyberstorm SCSI bus (one to connect the cyberstorm, one for the hard drive, and two for the active terminators at each end).  For two hard drives, you need a five position cable, three drives, six position, etc...  Make sure the drives all have internal termination disabled.  Then, as you mentioned, avoid connecting removable media devices such as tape drives, zip drives, or cd roms to the cyberstorm bus.  Either get el-cheapo IDE versions of these devices and hook them to the IDE port on the A4000 motherboard OR get an additional Zorro II/III SCSI controller and hook your (slower) removable media drives to the Zorro scsi card.      

Title: Re: 80 to 68 scsi
Post by: QuikSanz on March 18, 2006, 04:12:36 AM

@ stopthegop,

No, I have an A4000T from Amiga Technologies and it has on board SCSI.Device. All my drives are hooked to it at the moment and the CyberStorm MKIII SCSI is unused.

Chris

Title: Re: 80 to 68 scsi
Post by: stopthegop on March 18, 2006, 05:21:08 AM

right, forgot the newer "t"s have scsi.  The desktops don't.

Title: Re: 80 to 68 scsi
Post by: stopthegop on March 18, 2006, 05:22:11 AM

does yours have an onboard ide controller as well as scsi?

Title: Re: 80 to 68 scsi
Post by: QuikSanz on March 18, 2006, 06:27:21 AM

Hi stopthegop,

It may but, I have very little docs on this machine. I got it just before I moved and it's been in storage since end of April last year. Can not find the Cat Weasel for the Hd floppy and a few other things. The 18Gb drive got trashed in the move thats why new drive from Software Hut. However no luck yet. I still have a few tricks left to try. We'll see. Any input is welcome.
Thanks to many here I've made it out of much worse jams than this. At least it's running well, exept for the old small HD that I'm using.

Chris

edit PS: to tell the truth I'm not much interested in IDE. There are other things I would rather have my CPU working on. After all it's only 50Mhz.