Hello everyone, I just stumbled across this site, WOW!
I got a Superboard back in 1979 and it started me on what would end up being my entire I.T. career!
It was modded from new for an enhanced display (cant remember but perhaps 32 x something). I built lots of bits for it and would regularly make the drive from Chichester to Croydon at weekends to hang around at the premier publications offices. I built their disk controller and hooked it up to some 8" FDD which I had, their sound board, I had all the extended firmware and I modded the board to take bigger eproms which I used to combine all the code from the smaller 2k ones.
I still have it all here - well most. I ended up getting a 610 board to replace the memory board that I made and I remember sending my Premier Pubs disk controller and disks to them which they were going to mod to run 5.25" drives and convert all my software - sadly that's when they went bust and I never saw any of it again
I would love to drag it all out and run it up at some point - even just to see the D/C/W/M prompt!
I should also have all the manuals somewhere though looking at previous posts it would seem that you have this covered now. I even got hold of genuine OSI manuals at one point - what a geek!
I used the Premier Pubs sound card to drive a Centronics 737 printer via the additional parallel port that it offered.
Those were really interesting times and it started me on what was to be my entire career. I moved to the BBC Micro and did the same with that, loved programming the 6502.
If I can find any docs I will scan and submit them.
Great work, keep it up.