Just a simple emulator for the CDP-1802 microprocessor in a particular configuration.
This program must be run from the same directory as the data subfolder.
Windows:
1802emu.exe rom.bin
Linux:
./1802emu rom.bin
Right-click on the screen to reset. Should otherwise be fairly straightforward.
To compile this you will need to install Raylib (https://www.raylib.com) and GNU Make.
The 1802 could only access 64K of address space at a given time without paging.
This emulated system has two banks of 4Kb each, at addresses 0xC000-0xCFFF and 0xD000 to 0xDFFF respectively.
The bank selection addresses are at addresses 0xEA17 and 0xEA18 respectively.
This emulated system displays to a TTY of 64x50 characters, pointed to by the word at 0xFFFE-0xFFFF.
Each character of the TTY is two bytes. The first byte is the character code, the second byte is the color.
The character's color is encoded into the byte like this: XXrrggbb. Two bits red, green, and blue.