It's a Pico Sonoace, or Sonoace Pico. The machine itself can be seen here
Here's some relevant things I see when it boots up:
Award Bios 4.51 PG
SOM-4450 BIOS 1.11
Cyrix Media GX with MMX-S CPU
130048K ok with shared 1024K
IDE Primary Master Fujitsu MHT 2030 AT
Serial Port 3F8 2F8
LILO loading PICO....
(at which point the Pico screen pops up, and soon the program is fully loaded)
I'm unable to do CTRL-ALT-DEL, because the rudimentary keyboard has no delete key. But based on what I detailed above, it does seem to be a regular computer trapped in an Ultrasound's body.
In addition to the Serial port which was recognized, there's also a LAN port and a double USB port. I think those are the only possible input ports for peripherals. It has an empty monitor port, but I assume that'll show the same thing as the built-in monitor.