If #3 used a host process to emulate a disk drive, it could also emulate a VGA screen. Periodically (say, 60 times a second), you'd fire an interrupt which dumped all 8 KiB of screen RAM over the UART to the host process. The host process would then interpret the contents of VRAM and draw to a GUI window, like the Neotron Desktop BIOS does.
Alternative options include:
- finding a QEMU machine which has native VGA output, but which also supports a Cortex-M CPU.
- using the Arm FVP for the Corstone-300, which apparently has VGA support.
If #3 used a host process to emulate a disk drive, it could also emulate a VGA screen. Periodically (say, 60 times a second), you'd fire an interrupt which dumped all 8 KiB of screen RAM over the UART to the host process. The host process would then interpret the contents of VRAM and draw to a GUI window, like the Neotron Desktop BIOS does.
Alternative options include: