Hmmm, thanks for the tips fellas, I'll have a play when/if work, family and general life allows such frivolous use of waking hours .....
The reason I wanted this was that I don't have a 2nd DMS cart to go with my 2nd PB, and there's a space issue in my car with the DMS inserted.
Ahh, mirrors are the key, are they? I'll get some smoke off an old burning tyre and smash up my bathroom cabinet and see if I can't make a NAND gate or two. Watch out Intel ....