Your eBay description and discussion here, refer to the S-100 card as "a Digital Research product". Digital Research Computers/Corporation or DRC of Texas was a small manufacturer of S-100 cards and systems. They are NOT associated with Digital Research Inc or DRI of California, founded by Dr. Gary Kildall, creator of CP/M. I recall "DRC of Texas" ads in a number of period magazines. I don't know about the Tanner/DRC association. My recollection is that the cards are at the least similar. Jonathan, are they identical? If so, it may simply be a copy. Such things happened in the era without a business sale/purchase, but let me know of any further info, if you please. http://www.retrotechnology.com/herbs_stuff/d_drc.html That's a new Web page as of today; previously I listed my DRC manuals elsewhere. The new page lists the DRC products I have manuals for; and has the statement above.

The manual states the board is IEEE-696 compatible; however, that just means it follows IEEE-696 signal designations -- it is not 16-bit compatible.

IEEE-696 allowed for 8-bit data operations and 16-bit addressing, it's also part of the standard, cards are designated accordingly by their data and address "paths". I don't discuss details on my Web site, but the IEEE 696 standard document can be found on some parts of the Web; and as part of various Compupro documents, published articles, etc. I discuss the S-100 / IEEE-696 bus signals at: http://www.retrotechnology.com/herbs_stuff/s100bus.html However, the IEEE has enforced their copyright and asked Web sites to remove copies of their IEEE-696 documents. They sell copies of their standards (not cheap) on their Web site. Herb Johnson former "Dr. S-100" -- Herbert R. Johnson, New Jersey USA http://www.retrotechnology.com OR .net