<Ummm... must beg to differ here. While the SOL uses the VDM-1 circuitry, <it is an integral part of the main board rather than an S-100 add-on, and <I do not recall any variant offered that would have been minus the video <system. Oops, confused the systems. PT sole a board set that gave a virtual SOL but at S100 board level. The VDM-1 I have still works nicely in the Netronics Explorer 8085. In that case the SOL had the video locked in, that makes the point I was driving toward move valid. Allison