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Emulate a screen #4
Description
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.
Activity
thejpster commentedon Jun 25, 2023
The
lm3S6965machine has OLED support - see https://www.freertos.org/cortex-m3-qemu-lm3S6965-demo.html. But it's only 128x64 pixels and that's not a valid Neotron mode.thejpster commentedon Jul 2, 2023
Or I could write a Cortex-M emulator and combine the QEMU BIOS with the Desktop BIOS.