The Nimbus PC-186 came with the option of a SCSI controller and multiple Hard Drive configurations.
The standard equipment Hard Drives were:
A fully populated card was required. If only half populated, its functionality was limited to just floppy drives.
Other examples of the controller boards are as follows:
SCSI 1 hard drives are now difficult to get hold of and fragile.
Technology now exists to impersonate a SCSI 1 Hard Drive via a controller and SD card:
Developed by an Australian guy called Michael McMaster http://www.codesrc.com
Here are some images of the controller fitted in a Slimline PC-186:
The Version 5 unit allows upto 4 devices.
Unfortunately the way in which the device adds drives, it does so on a 'per controller, 1st drive' basis
The Nimbus has it hard coded that the 2nd external drive must be on the 2nd drive of Controller 1.
This renders the 2nd external drive (E:) unusable, you do however get C: D: & F:
Using the maximum native sized drive available, the Conner CP3040 you get 40Mb per drive.
Booting from drive C: works perfectly
The process of establishing a new drive (real or SCSI2SD) is as follows:
I used a 2gb microsd from SanDisk, configured in the following way:
The Firmware used was 4.6 and the configuration file can be downloaded from here
Run 'config' and indicate how many internal & external winchesters the Nimbus has
The hard disk then needs to be prepared
There are limitations on the SCSI drives that can be used, refer to the list at the top of this page.
This is due to the proprietary way in which the drive is prepared, using the RM Software, HDFORM.
Select the appropriate controller and drive
...after a countdown timer of 5 minutes (presumably to give you time to abort should you think better of wiping the drive) the hard disk should then start formatting (not to be confused with a DOS format)
Next step is to run 'stamp', which prepares the partition.
After a reboot the drive is then required to be DOS formatted in the normal way (if its the boot drive, format c: /s).