Joe <rigdonj(a)intellistar.net> wrote: [snip] 1983 is probably about right -- it's not in the 1980 or 1981 Measurement/Computation catalogs. Instead there is something called a 2240A that seems to be about the same idea. Hmm. I guess I don't quite understand how this is substantially different from a 6940B or 6942A Multiprogrammer, but then I haven't worked with any of them. Well, the 694xs get a few more pages in the catalogs, look like they might have a wider range of I/O cards, and I gather the 6940B may be what you needed to resort to for faster-than-HP-IB communications with the controlling host processor (it can use a 16-bit parallel interface). Joe, did you tell me (in private mail) that this thing was mounted in a rack? There's a picture in the 1981 catalog of something called a System 9030 that looks like a desk-height rack with woodgrain top and wheels, and the accompanying paragraph of text: "The HP 2240 can be installed in a roll-around cabinet with plug connectors for portable use. Adding a controller (HP 9825, 9835, or 9845) and available exercising software, the preconfigured combination is called the HP System 9030. Contact your local HP office for information about specific ordering constraints." The picture has what I'd guess to be a 9835A sitting on the woodgrain top, presumably looking like the expected controller. If the 2250A is anything like the 2240A, it's a smallish 19" rack-mountable box, maybe 12" tall. Meaning that about half the System 9030 rack is taken up with something else, maybe the "plug connectors" mentioned above? -Frank McConnell