SCSI CDRom Jumper settings?

[MickTheLip]

I have 7 jumpers to set on the back of the CDRom.So which do I need to set the drive up to use my Squirrel interface?
1-ID1
2=ID2
3=ID4
4=Parity
5=SectorSize
6=Reserved
7=Term Power

Anybody able to advise me which jumpers to set on the drive?What is the parity jumper for? The Term Power jumper I presume is the onboard terminator needed with SCSI?

The drive is an IBM CR-506-B

[MickTheLip]

Could do with some help here as I'm a SCSI Virgin user folks!Looking to get rid of IDE on my other systems as I find it very unstable to say the least.

[motorollin]

If the CD-ROM is the last device in the chain then you need Term Power set. Then just set the drive to ID1, 2 or 4 so that it is unique.

--
moto

[adolescent]

Term (terminator) power  and terminator are two different things.  If the device does not have a terminator jumper, then it must be terminated externally.  (It shouldn't hurt to have term power on but it might not be necessary.)  Provided your SCSI chain is setup correctly (ie. terminated) you should only have to set the SCSI ID on the device.

[A4000_Mad]

Doh! I sent Mick a CD0 set to 'squirrelscsi.device' and Unit 3  :-P

But I guess he can just put a jumper on both ID1 and ID2 to make it ID3?

A4000 Mad

[MickTheLip]

Hi Guys thanks for the tips but what about Parity what does that mean? @ A4000 Mad I've tried your CD0 but no joy on SCSI CDRom that was origionally fitted so am trying to get one of the job lot CDRom's set up.I get the same result drawer opens and closes the light comes on briefly after closing but only difference is CDRom is still spinning but no icon and no light after initial insertion of a CD.Going to have a go with setting up some of the other CDRoms I got in the job lot of ten!!!!Would like an explanation of parity though but keep it simple please!!
I forgot to say using the software to find the hardware does not show up any CDRoms at all.The one included on the Squirrel install discs and the one of IDE Fix? that A4000 Mad sorted for me

[adolescent]

@Mick

Parity is just an extra bit that is sent as a sort of checksum to ensure the integrity of transfered data.  If in doubt, turn parity off.

[adolescent]

More information needed:

What jumpers do you have set?  You should only need the ID set (Take off all the jumpers to have it set to 0, or set it to 3 as Mad said above by closing the ID1 and ID2 jumpers)

What is your cabling configuration?  Should be something like Squirrel (cable) -> CD-ROM -> Terminator

Do you have squirrelscsi.device in DEVS:  (if so, what version?)

Post Mad's CD0: here for us to critique.

[MickTheLip]

Sorry Folks cannot do that at the moment 1200's half stripped down. I've tried altering the CD0 to various ID's but no result. Using the Squirrel software I can't find any CD Rom no matter what ID I set it to.Neither the Find Device software that Mad sent me does'nt find any CDRom either.I'm getting an external CDWriter through any day now so I'm going to try setting my Amiga with that it has the power supply built in fed by a mains cable.The enclosure I'm using at the moment is a bit flakey might be due to non origional powerpack.

[MickTheLip]

OH Joy Oh what heaven I now see the CD rom Icon on my workbench!!!!! Dont ask me how I've finally cracked it but using the origional CDRom I've got it working.It would appear the Power computing manual I got with it that said device 3 was not right.In fact it shows up as device 1 the only other thing I did was really push the Squirrel into the slot with a lot more pressure that's all!!! Ran the install software and it did as it was suposed to at each stage.The next step is to change the drive out to one of the IBM drives to sort out the jumpers and how they work out the device number and I'm home and dry.CD copying is that possible if I add an external SCSI CDRW as another device to the chain?

[A4000_Mad]

OH Joy Oh what heaven I now see the CD rom Icon on my workbench!!!!

CD copying is that possible if I add an external SCSI CDRW as another device to the chain?

Congratulations on finally getting it working mate   :-)


Yes CD copying is possible....

http://www.amiga.org/forums/showthread.php?t=27937

..... and MakeCD is now available with FREE registration  :-D


But in an A1200 Desktop you'll probably need an 030 or 040, extra RAM and a SCSI CD writer with buffer under-run protection (and probably a few :pint:  :pint:  :pint: for anger management  :lol:)

A4000 Mad

[MickTheLip]

I saw the news about Make CD!!!My SCSI CD Writer arrived in the post today unfortunately its the 25 pin variety!! Could not see that in the photo on Ebay just looked the same as the one I've got.What cables do I need to try and get it working on the chain? At least the ID is alterable without having to take it out of it's casing and it also has an inbuilt jumper for termination on the back as well.

[lopos]

A4000_Mad wrote:
Doh! I sent Mick a CD0 set to 'squirrelscsi.device' and Unit 3  :-P

But I guess he can just put a jumper on both ID1 and ID2 to make it ID3?

A4000 Mad

I think you are a bit confused.
If you have ID1, ID2 and ID3 you should jumper ID1 and ID2 to set the Unit to 3.
ID1  ID2  ID3  Unit    X=No Jumper -= jumper
 x    x    x    0
 -    x    -    1
 x    -    x    2
 -    -    x    3
 x    x    -    4
 -    x    -    5
 x    -    -    6
 -    -    -    7

that's how it works on most of my SCSI devices. Hope that help you a bit.  :-D

[voxel]

well :-)

Parity checking is one part of the SCSI standard that is used to assure that the datas read (or written) are really what is on the scsi device.if I remember well, setting that jumper will invalidate the parity checking.

You should let that jumper in the state it was. :-)

Important Note :

SCSI ID 7 is reserved to the SCSI controler (here the Squirrel interface) and should never be used for a drive!
This is valid for all SCSI controlers and devices.

[A4000_Mad]

lopos wrote:
you should jumper ID1 and ID2 to set the Unit to 3

"But I guess he can just put a jumper on both ID1 and ID2 to make it ID3"

I thought that was what I said mate, but many thanks for your help  :-)


@ MickTheLip

Hmmmm.... So you need a SCSI lead and converters for a SCSI CDrom and a SCSI CD writer with different connections. I'm sure it must be possible to find them, but its time for that first  :pint: me thinks  :-)


A4000 Mad