This is a simulator of the simple CPU with a microprogrammed control unit. For now, the best description of this simulator is still on Dr. Eckert's website.
##Installation and Run instructions
This is very much a WYSIWYG layout. I've used CMake for the building process, but
there's only one C file (with no dependencies!), so you can compile it in one line with any C
compiler that supports binary literals (e.g. 0b011010101). NOTE: There was some very strange behavior
observed when this code was compiled with the -O3 flag, so I'd suggest staying clear of using any optimization flags.
There are three input files for the program:
-
ram.txt: this is the "program". It is a raw text file where each line is a 12-bit value. Currently, the program supports a max size of 256 lines, but this wouldn't be hard to adjust. -
addr.txt: This is the mapping between opcodes and ROM addresses. To extend this instruction set, put the address of the entry point for the new instruction. -
uprog.txt: This gets loaded into memory as the "control matrix". Theclock_tick()function pulls a "µ-instruction" from the ROM, an modifies registers according to the bits in the instruction.
##Future Work
I'd really like to build a decent TUI suing curses, but that'll be on the back burner for quite some time.