Epson CW3S16 Operation Manual page 217

The message box in the middle of the screen displays:
This test will run for about 2 minutes. Press <ENTER> to
return to the main menu when the test is completed.
Figure E-21. Serial Communication Adapter Test
E-54 Advanced ROM Diagnostics
A: 1.2MB #03F8 #02F8 Color
Display Printer
#0378 Real=64OK
Extd = 3328KB
Absent