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UX/UG/UR models are generally a pain to maintain. As soon as you import one change the capacitors in the CRT PSU card and Computer PSU card or you'll be in a world of pain. The models with -40 or -80 at the end have an internal SCSI hard drive that is dead by now of course. The U* models have a removable plate on the right side to insert 1 RAM card. Stock they all come with 2MB of RAM and you may add a maximum of 8MB ram card for a total of 10MB.
The U* models also can function as monitors for other FM Towns computers. There is an outport for RGB on the rear towards the bottom if you wanted to feed it into a capture device or other monitor in case yours is dead.
There is also RGB input port towards the upper right side. Slide the switch to have internal or external display. I've also seen some U* models in Japan with a video card and a DB15 cable feeding it BACK into the CRT input permanently outputting 15khz.
If adding a hard drive the SCSI hard drive ID must be set to 1 or higher. There is no SCSI ID 0 available in U* BIOS. All of the CD rom drives are single speed and can be used in other desktop models with 4 expansion slots in the back.
UX model. 386SX at 16mhz
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UG Model. Notice the FAST mode light on the front. It also says FM TOWNS II on CD rom drive. 386SX at 20mhz
UR Model Notice the FAST mode light on the front and say UR on disc drive. Has 486SX
