@ twizzle
Sorry if this duplicates what you have said but your post was not here when I went off to continue working on this in an A1200 Desktop.
Hi Mick,
Well I did threaten to return :lol: You could have a hardware problem by the sounds of it, but a ramble and a few screenshots might help you or somebody somewhere with something
My one of these.............

.......... plugs into the bottom socket of this Sony CDrom.

I have no jumpers to set and nothing goes in the top socket (yours is probably a lot different by the sounds of it and may indeed need a terminator). I can only push in the tiny buttons to increase or lower the unit ID number. It is currently set to 3.

In the above screengrab I have used 'FindDevice' taken out the 'IDE Fix 97' drawer in an A4000 Desktop. I simply ticked the box 'Show All Device Types' and then clicked on 'Scan'. On the left you can see that the CDrom is showing up as a 'squirrelscsidevice' and on the right as Unit 3 in the list. You might want to *check* that you do have 'squirrelscsi.device' in Workbench:Devs
NOTE that I have not used 'FindDevice' for any setting up purposes. It is just a good way of checking that your A1200 can see your CDrom on the PCMCIA slot. *All* you need to get your CDrom working is a CD0 icon in Workbench:Devs/DOSDrivers that is set to the correct device type and unit number.

The above screengrab shows what Amiduffer was telling you about. i.e. clicking once on the CD0 icon, selecting information from the menu and changing the unit number and device type.
However, it appears that doing this only changes the 'CD0.info' file and not the mounlist of CD0 itself. Below is the mountlist viewed in DirectoryOpus. So you need to make sure that the bottom two lines are correct in something like DirectoryOpus as well. i.e.
* Device = squirrelscsi.device
* Unit = 3
Oh... the icon CF0 that is also in the screengrab is for working a Compact Flash card in the PCMCIA slot.

I guess I should finish off with a screengrab showing the icons of an inserted OS3.9 CD. And for newbies or those interested, the great game icons are what you get when you use the WHDLoad installers :-)

Possibly remotely interesting stuff:-
The screengrabs were taken using CyberGrab on a ToolsDaemon menu so as not to take a grab showing the prog itself. The ILBM screengrabs were then loaded into PPaint and coverted to PNG with maximum compression. The PNG files were then put onto a Compact Flash card and taken to a USB card reader on this PC. (I had to remove the Squirrel and CDrom so as to be able to insert the Compact Flash card into the PCMCIA slot of the A1200 Desktop of course)
Well that's my brain cell exhausted for today.
G'night :sleep:
A4000 Mad