Win OSI EMULATOR homepage


To the right, this was my first home computer, an Ohio Scientific Superboard II. I bought this all in one machine from someone in Würseln, a small town in Germany, in the early 80's. Today the machine does not exist any more only a few ROM's and some handbooks, articles and program cassettes survived.
When in 1997 emulation became more common I started to write my own Emulator. A Windows version of the emulator with some updates over the last years can be downloaded in the Software section, thanks to the continuous interest of emulator users.

Last updated Rev 1.7 Emulator now with Sound and several improvements managing files. YE-DOS now runs very well in newer 1.44MB drives and on older Shugart 400. There is a 32bit and 64bit version available with a minimum requirement of Windows 7. OSI Software files and link's have been renewed. Recently, I had to move my OSI homepage from SQUARE7.CH to a https Google Site and I hope I've found a new good home for this site. Please check out the Tools and utilites site


Superboard II - Year 1977













Check out the Emulator !

WinOSI Emulator Download



How all began

After my TI-57 programmable handheld calculator the Superboard II from Ohio Scientific was my first computer. Around 1980 I got this machine, a 6502- based single-board computer with 8K of RAM and BASIC in ROM. The board needed an extra 5V, 3A power supply to run. (everything needed something extra)

The board was a revision B and had from the previous owner some enhancements in the VDU section to display the entire 32x32 characters on a standard TV monitor.

The main board design was quite simple by today's standards but the double sided board had a good quality ideal to do various modifications. The chips were 'normal' TTL and the board contained the keyboard, CPU, ROM, RAM (up to 8K on board), a video section for connection to a monitor or TV via an RF modulator, and cassette I/O.

Upon boot-up, the user was presented with a prompt for 'D/C/W/M ?' which allowed you to boot from disk, cold boot, warm boot or enter the monitor to debug machine-code programs. There was no disk drive and no integrated controller and due to the high market prices far out of reach.








Last Update: Nov 2023