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.
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 $-)
Wednesday 17th May 2017
My first computer. Learned to code in BASIC and 6502 machine code. Wrote a ''snake'' type game and high-speed machine-code line drawing routines so that I could animate a rotating cube in real time. I expanded the memory to 12K by piggy-backing 2114 chips on top of the ones on the board and wiring up the chip $ pin to the address decoder chip. Good Times. Best story though is the night I brought it home from the store. It had been wrapped in tin foil - protection from static shock - so I though I''d just leave it sitting on the foil when I switched it on. Not a great idea. Fortunately, just blew the on-board fuse so I was back up and running in a few minutes.