I adopted the Serial Platform Emulator for GOLDELOX.
Tested commands:
BCEFILOPprsUVY@A@I@r
Changed behaviour:

• g: Commented out to save precious RAM
• I: 128 byte chunks transferred with software handshaking, see 4DCmdLine, 4D.cpp, displayImage()
• Y: mode=4: SCREEN_MODE

4D-SPE-V1_0-GOLDELOX.zip