I just have the one internal floppy drive. You can see the machine from my Hercule photo.

UPDATE: Something interesting happened. I thought I would press the Interrupt button to see the the Mac SE Easter egg which is four photos of the development team. Type G 41D89A. I couldnt enter any text - what a surprise! However I received a sad mac face with two codes:

0000000F

0000000D

I've read it's important when the sad mac face appears. So in summary, I get a happy mac face when booting from the floppy for about two seconds, it then ejects the disk. If I press the interrupt button at any stage, I get the sad mac with the same codes listed above.

Searching the Internet revealed the following, but I am unsure if this is only for sad mac on switch on rather than interrupt.

"Check & Replace Bourne Filter/ Resistor Network chip @ U2B (RP2) & U8B (RP10)"

Any help would be appreciated. Very frustrating.