GRG16: Update
Progress on the GRG16! I decided the next project waypoint for me was going to be an emulator which loads a boot/BIOS rom which will display a 'No cart inserted' message on screen. This seemed like a good target because it would mean integrating some kind of programming, defining graphics data and enough of the emulator machine itself to display it. So far, progress has been slow but steady. I have implemented a rudimentary assembler in Python which can also include raw hex. The current version can parse/assemble asm code and also extract pixels and/or palettes from images (using the Pillow Python library). I'm sure there are plenty of bugs still to find in it, but the file it produces passes the quick-scan-in-a-hex-editor test. I've also made some progress on the emulator side. In addition to the VPD I worked on previously, the CPU is pretty much implemented, and I've just implemented a BusController to move data between boot/BIOS rom, cartridge, RAM...