I'm new to the boards and I'm hoping I can ask some of the more experienced hands for advice. I only really used BBC's when I was at school in the 80's and most of my retro computing / projects are with Sinclair and Commodore computers. However recently I managed to acquire a BBC Master 128 with a pretty awesome Retroclinic Datacentre. I've been having a great time getting to know the machine (I even fired up Granny's Garden !)
So the last 3 weeks have been something of a learning journey

I've been reading up on the threads here and at other sites on the interwebs and I've done a fair bit towards getting my Master back to a good working order. I pretty quickly realised it didn't have a battery pack and added one so it would retain settings. I also moved the ROM for the Datacentre into the right slot so I could access the full 128K and run games like the pretty amazing port of Stunt Car Racer and I've set the *STATUS settings to the ones most recommended and so it boots to RAMFS
One thing has me stumped and I think I know the answer but I don't know how it will work :
I want to run games that don't seem to work natively with the Master. From reading I figure that they need OS1.20 as in the old Model ?
If that's so, then I figure I need a MultiOS switchable ROM. (Again Retroclinic seems to have just what I need).
But,
If I have that installed and set to 1.20 would I still be able to access disc images from the USB on my datacentre? or would I need to add or do something else?
Sorry if this is covered somewhere else.
Thanks !