Parts Kits Now Available!

For sale are new-made reproductions of the Ohio Scientific 400 "Superboard" 6502 CPU board. These boards were produced from 4000 DPI scans of an original Ohio Scientific 400 board and are 1:1 with respect to trace and hole placement. They were run on standard thickness FR4 stock, which is thicker than original OSI stock, to reduce the excessive flex experienced with original Ohio Scientific products.

These boards have been scanned and reproduced as part of the Ohio Scientific Preservation Project. Full documentation is available in PDF format online. You can learn more about the OSI Preservation Project here or at the Glitch Works -- please join the OSIweb forums! See our other listings for more reproduction and newly designed Ohio Scientific boards!

The OSI 400 "Superboard" was Ohio Scientific's step-up offering from the OSI 300 and provided the basis for a more expandable system. The OSI 400 is a single-board computer, supporting 1K of static RAM and 512 bytes of ROM (2x 1702As), along with a 6850 ACIA for the console serial port. It also provides OSI 48-pin bus compatibility and an uncommitted 40-pin DIP prototyping area that can be used for a 6820 PIA, 6530 RRIOT, more RAM/ROM, etc.

While the OSI 400 board is usually seen with a 6502 CPU, it also supports the Motorola 6800 CPU and MOS 6501 CPU (due to a lawsuit from Motorola, the MOS 6501 was never produced in large quantities). This is one of the only production boards to specifically mention the MOS 6501, and this board can indeed run the 6501 -- we've done it in-shop to test 6501s for other hackers.

Full parts kits are now available for the Ohio Scientific 400 board:

• "Vintage Look" parts kit option
• 1K of 2102 static RAM option
• Choice of pre-programmed ROMs

All parts kits include high quality machine pin sockets for ICs that should be socketed.

The "vintage look" parts kit includes carbon composition resistors, vintage precision resistors for the bitrate generator, polystyrene capacitors for timing components, a hermetically sealed axial tantalum capacitor, and radial ceramic bypass capacitors.

Please make sure to choose carefully when selecting CPU, ROM, and RAM choices. If you have questions, contact us before buying -- we're happy to make suggestions as to the best configuration for your needs!