Stuff related to Ben Eater's 8bit breadboard computer

Marijn van Vliet

Last update: Dec 29, 2022

Related tags

Text Data & NLP 8bit

Overview

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 example_programs/test.asm

If you want a closer look at the assembler output:

python assembler.py example_programs/test.asm

Programming the computer using assembly language

This simulator reads its memory contents from a text file with the .asm extension. The file should contain programming code written in assembler.

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 comments using the ; character, writing raw values with db and labels. Here is an example assembler program that uses all the features of the assembler:

;
; Test program that adds two numbers
;
	lda a  ; Load the memory contents at the (a) label into register "A".
	add b  ; Add the memory contents at the (b) label to the value in register "A".
	out    ; Display the value in register "A" on the 7-segment display.
	hlt    ; Halt the clock. This signals the end of the program.

a:         ; Label that marks memory location (a)
	db 28  ; Write the literatal value "28" at this memory location.
b:         ; Label that marks memory location (b)
	db 14  ; Write the literal value "14" at this memory location.

More example programs can be found in the example_programs/ folder of this repository.

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In this version, the RAM contents and microcode EEPROM contents can be written and loaded in binary form. These binaries match the ones on the physical machine. This allows you to either generate RAM or EEPROM contents using the python scripts, or load a memory dump from the RAM or EEPROMs on the breadboard into the simulator. Try calling simulator.py, assembler.py and microcode.py with the --help option to get instructions how to load and write binary blobs.
Source code(tar.gz)
Source code(zip)

Stuff related to Ben Eater's 8bit breadboard computer

Related tags

Overview

8bit breadboard computer simulator

Installation

Usage

Programming the computer using assembly language

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