(for opcodes, see opcodes.md!)
The CPU has 16 registers, named R0-Rf. All of them are 8-bit. They’re used for storing data for quick access and for calculations - data from memory must first be copied into a register and then processed. Rf is often set by math operations to whether an overflow occured during that operation, so be careful when using it.
Additionally, the CPU has two 16-bit “registers” called Ri and Rj, representing the memory pointer and the disk pointer respectively.
Since PC64K has 64KB of memory, the program counter is 16-bit.
Up to you! (100Khz in my implementation, 1 instruction = 1 cycle)
Up to you! (128 16-bit values / 256 bytes in my implementations)