Akai S1000 / S1100 samplers

I hope there are still people out there who love the machine, and I 
have a few question if anyone can help??
1 I have version 4.4OS but my manual is 2.2 and the method it 
describes for copying your OS floppy does not work!! Can anyone tell 
me what to do or copy me a spare OS Disk?

2 How can I tell how much RAM is onboard?? Do I have to take the top 
off and look inside? And how far can I expand it and with what RAM?

3 Anyone have any ideas where I can get a SCSI card cheaper than 
£150.00?

I saw a thread where someone mention buying sample libraries on 
floppy or HD - if you are still out there please get in touch.

And if you are new to this wonderful old school machine and want to 
learn together send me an email.

Many thanks to you all.

Best wishes

thedarkleo.