Thank you for the replies. Let me go into detail a little further:
I have an Apache-Labs Anan-G2 HF Transceiver with a 7-inch front display. There is also an external monitor hooked up (1920 X1080). The radio featured a Raspberry Pi CM4 to power it. The rig runs under the Linux OS, and initially had a Desktop environment. Pull-down menus, folders... it was nice, and everything could be done from the Anan-G2 radio.
The Raspberry Pi CM4 was marginal when used in the radio with a pihpsdr program. So the Radxa CM5 replaced the Raspberry Pi CM4, with much better results. 8 Cores instead of 4, with each core having a FPU... Some data lines in the Radxa CM5 used 1.8V, instead of 3.3V as in the Raspberry Pi CM4. This was solved by using a Raspberry Pi RP2040-PiZero, to convert the GPIO data from connector to USB. There are some issues to resolve, but it will work even better than the original Anan-G2 (with the pihpsdr program). Right now the screens (both on the Anan-G2 and external monitor have no desktop environment with GUI. I miss that! In order to make updates to the pihpsdr program, I have to log in to the radio with a separate PC. It is not as convenient! I am told that Labwc and perhaps Wayland can be used, I believe that is what they are using now in the radio. The only item that shows up on the screen is pihpsdr and a small menu when pressing the left mouse button. If I disable full screen mode on the pihpsdr program, I can drag it to the external display's monitor.
