Hello Colin,
That would be a Swedish "tack".
>the battery is still there
Any difference if you temporarily remove it?
>I have two SCSI Externals and IBM and a Rodime - they both run with the PB via the adaptor
Two hard drives, I suppose. With an appropriate system folder (7.6.1 or higher, see http://support.apple.com/kb/SP170) on one of the drives, it should be be possible to boot the PowerBook 1400c/166 from the external device. With an active system on the internal hard disk, set the Startup Disk control panel to the external disk, or hold down the four keys Command(Apple) + Option(Alt) + Shift + Delete(Backspace) at startup.
>get the LC475 to recognise one or the other
That should work. With a system folder (see http://support.apple.com/kb/SP211 for the supported systems), it would be bootable. However, do not keep a bad internal hard drive connected. As always, only disconnect cables when the computer has been switched off. Also, check that the SCSI termination is OK (http://support.apple.com/kb/TA27743).
>its INT SCSI has stuck and doesnt boot
There have been reports about "swinging" a hard drive that is not spinning. The intention is to try to free the platters by a rapid movement.
>I have a System Enabler 065 ready to go on one disc for the 475
That enabler is only required for System 7.1. Later systems supported for the LC 475 do not require an enabler.
>I was looking at a FW/USB card
As I indicated earlier, this is not going to work (the PC Card slots in the PowerBook 1400 cannot handle 32-bit CardBus, only older 16-bit cards). So, if you wish to use an external CD-ROM drive, it would have to be SCSI.
Alternatively, you could buy an inexpensive PC Card adapter for CompactFlash, and then place a standard CompactFlash memory card in the adapter. Once reformatted to Mac (normally PC-formatted), the CF card will act as a normal hard drive (it can even be made bootable in many cases).
The CF card solution is good for transfers and backup. You could use the same PC Card adapter plus the CF card in another PowerBook (with a PC Card slot), or the CF card alone in a USB memory card reader (connected to a USB-capable computer).
Finally, a PowerBook 1400 can operate as an external hard drive in "SCSI disk mode", connected to a desktop computer with a SCSI port. See page 51 in the manual for details: http://manuals.info.apple.com/MANUALS/0/MA762/en_US/0340070APB1400UMRV.pdf .
Jan