8bit breadboard computer simulator
This is an assembler + simulator/emulator of Ben Eater’s 8bit breadboard computer.
For a version with its RAM upgraded to 256 bytes following the instructions by /u/MironV, see, see the ext_memory branch of this repo.
Installation
Either clone the respository, or download the code. On windows, you’ll also need the windows-curses package to display the user interface (on other platforms, curses is included in the standard lib).
Usage
Write your test program in assembler and run it through the simulator.
python simulator.py test.asm
If you want a closer look at the assembler output:
python assembler.py test.asm
Programming the computer using assembly language
Supported assembler instructions:
nop No operation
lda # Load memory contents at # into register A
add # Add memory contents at # to register A
sub # Subtract memory contents at # from register A
sta # Store contents of register A at memory location #
ldi # Load the value # into register A
jmp # Jump to memory location #
jc # Jump to memory location # if the carry flag is set
jz # Jump to memory location # if the zero flag is set
out Output contents of register A
hlt Halt the CPU, end of program
The assembler also supports writing raw values with db and labels:
;
; Test program that adds two numbers
;
lda a
add b
out
hlt
a:
db 28
b:
db 14
