The Superboard II, also called Model 600, was quite the same board as the british clone Compukit UK-101.
It came in only ready built version and did not featured neither power regulation on board - User had to build or buy a 5V external power supply - nor RF modulator to display on a standard TV, but only a composite video output.
A 40 pin IC socket allowed an expansion board and OSI bus to be connected, giving access to memory expansion (up to 64 KB) and floppy drive controller.
See in the 'Read more' section a very interesting information about Mike Cheiky, the founder of OSI.
Also a Superboard II owner, a machine I fondly remember. After a couple of years the masked roms developed a thermal fault (only worked when cold) but the documentation was so good that (even as a teenager) I was able to clone the whole machine onto a home made card-frame of veroboards (with the errant ROMs copied onto an eprom). That machine probably taught me more than the engineering degree I later took :)
Monday 25th June 2018
Myk Dormer (United Kingdom)
I still have mine, I got it when I was in college but I don''t remember what year, maybe 77 or 1978?
Sunday 20th May 2018
I have my original Superboard II on the wall in the shed. It no longer works due to Mr Rat releaving him self on the pcb. I had the hand soldered 64x40 character, 512x320 pixel graphics option. i have the work notes to go the mod somewhere. i will have a mint condition C1P and Orange ''green screen'' CRT $-)