link: http://www.ebay.com/itm/272817996082 I'm selling some of the prototype boards for my GW-OSI-RAM1 Universal 128 KW RAM board. This board provides up to 128 KW (64 KW without memory management) of static RAM on the Ohio Scientific bus. It supports a 12-bit word size and is compatible with the Ohio Scientific 560Z "Processor Lab" in PDP-8 mode. It also includes a prototyping area, and a header for mezzanine display boards. Included with the auction is a Hex Lamp Register and an Octal Lamp Register, which can be mounted directly to the GW-OSI-RAM1 or used remote on a cable (e.g. for a front panel). This is a pre-production board, the most significant difference is that it lacks a corner mounting hole, which can be drilled if needed (no circuit traces run under its location). The other differences are minor. See auction link for full description! Thanks, Jonathan