The Ux component IDs are completely made up. There is no IC on this board that is labeled or identified. I found this in a PS/2 Model 50Z (likely making it a RamQuest IIz). This adapter seems to do nothing more than emulate the IBM 16-bit 2 megabyte extended memory adapter. (However, I've not yet tried using it with the option disk provided below.)

Have you got any documentation or other information about this adapter? Tell me!

Here, as contributed by a reader of this page, are both the original option diskette and a picture of what it looked like. You'll need a program capable of writing disk image files to an actual diskette. WinImage or rawrite will both do very nicely. (A very big picture of the option diskette is here. It's not suitable for dial-up or users of heavily metered connections.)

In case you find yourself in the increasingly common circumstance of having a computer without a floppy disk drive, or without a low density 3.5" diskette, here's a zipped version of the option diskette's contents.

U1 - L1A3479 (same as the RamQuest 16/32 - does this mean the RamQuest II could do more with an Orchid ADF?)
U2 - Dallas DS1000-125 (a five tap silicon delay line)
U3 - Lattice 20L8 PAL
RP1 - Resistor Network

The RAM chips on mine are all Fujitsu MB81256-12. (Yes, this is both the ZIPs in row A and the DIPs in rows B and C...) Memory in bank A is soldered in place.

Why is it possible to disable bank A? (My guess is that you could bypass failed memory this way.)

Orchid was bought out by Micronics. (Micronics made at least one planar/motherboard for IBM to use in a PC Server.) Micronics was bought out by Diamond Multimedia. Diamond did not return my request for information on this adapter. Of course, Diamond has been through a number of different organizations and companies as well. It's likely that anyone working there now has no memory of these older products. Whatever records existed about these products have probably been tossed as well.

Globe, Incorporated of New Jersey made the savage purple tabs. They are P/N A1012 and A1006. I thought that Globe had gone out of business (or maybe just didn't have a web site?) but I was wrong!