I’ve never messed with this layer before. I usually play with Arduino or FORTH, the first with the IDE, and the latter with a simple UART connection after using the Microchip toolchain to load the FORTH interpreter.

I was looking at putting a new (to me) version of FORTH on a MSP430F149 that I have had lying around for years. I have a homemade Goodfet 42, so I can technically use it to program through JTAG. However, it would be more fun to see how far I can get into the hardware from scratch. Perhaps I might connect another microcontroller to do the I/O through the terminal within emacs. What is the simplest path to sending byte data and manipulating a couple of I/O like the additional pins of a CH340 or RS232?

I just got Doom emacs running. I would like to get as far as developing a filesystem and tree to write assembly. I also dabble in AVRs, Espressif, and Micropython on STM32s in addition to FORTH on AVRs and PICs. If anyone has any advice please share. Call me a noob in all of them though. I’m doing good to make a cat excited by a servo and LED.

Any advice or references are welcome.