My 'newest' one: an Epson QX-10

I picked up an Epson QX-10 yesterday for $22. It came with 256k of RAM, CP/M 2.2, Valdocs 1.19 and Valdocs III+. Most intruiging is the single card in the expansion slots: a Titan Technologies QX-PC. I gather that this was a 8088 and memory that allowed the Epson to run MS-DOS and MS-DOS software (kinda like its big brother, the QX-16). I have the "QX-PC Pre-boot" disk and the "MS-DOS v2.11" disk that apparently came with the Titan card. On the Pre-boot disk is a CP/M system and two .COM files: QXPC, which when run claims to be testing the QXPC card but never finishes; and QXDISK, which complains about the harddisk(!) being misconfigured or not responding and returns to the CP/M prompt. Is/was there a harddisk option for the QX-10? What other options are/were available for it? Any ideas about what might be wrong with the QXPC card? I noticed there's a whole lot more information about the Epson portables (the HX and PX) on the 'net than there is about the QXs. -jrs