LogicEmu - Online Logic Simulator

This requires JavaScript to run. Here are a few options to run it:

Use a browser with enabled JS support to view LogicEmu running here, once loaded it runs locally.

View the source code on github

Run LogicEmu offline: download the html and js files from github or with 'view source' here, then open index.html from disk with a browser (offline if you wish).

Even though it's called an 'online' logic simulator since it can be ran conveniently in the browser, LogicEmu runs completely offline. Once the HTML and JS got fetched, it doesn't make any further connections. All circuits are already loaded since they're part of the source code. If you get LogicEmu from github you can run it offline from your own disk. Settings and edited circuit are stored in local storage (not a cookie), which is private to you, not shared. Sharing has to be done manually, which you can do either using the source code of a circuit or a base64 URL if it's small enough. Screenshot of it running a circuit: LogicEmu screenshot

Here are examples of what circuits look like in ASCII: 0"8-Bit Ripple Carry Adder" "128" "64" "32" "16" "8" "4" "2" "1" l l l l l l l l ^ ^ ^ ^ ^ ^ ^ ^ l<o<a e o<a e o<a e o<a e o<a e o<a e o<a e o<a e s ^ ^^^/^ ^^^/^ ^^^/^ ^^^/^ ^^^/^ ^^^/^ ^^^/^ ^^^/ a e . a e . a e . a e . a e . a e . a e . a e . ^^^ ^^^ ^^^ ^^^ ^^^ ^^^ ^^^ ^^^ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . s . s . s . s . s . s . s . s . . . . . . . . . s s s s s s s s 0"Wire Crossing from NAND" ...>A.... . ^ v s...>A..>A>A...>l v ^ v ^ A.. A.. ^ v ^ v s...>A..>A>A...>l . v ^ ...>A.... 0"Shift Register" 1"parallel input" s s s s s s s s . . . . . . . . "W"s.....+.....+.....+.....+.....+.....+.....+.... . . v . v . v . v . v . v . v . v .>a.. .>a.. .>a.. .>a.. .>a.. .>a.. .>a.. .>a.. . . v . v . v . v . v . v . v . .]a>o .]a>o .]a>o .]a>o .]a>o .]a>o .]a>o . ^ . ^ . ^ . ^ . ^ . ^ . ^ .>d.. .>d.. .>d.. .>d.. .>d.. .>d.. .>d......>l 0"serial output" c c c c c c c ^ ^ ^ ^ ^ ^ ^ "C"s.............................................. Supported Components

-|/\ — wires

. — wire split, corner

+x* — wire crossings

(space) — isolator

": — text, label, comment

^>v< — gate and device inputs

m]w[ — inverted gate and device inputs

s — switch off

S — switch on

p — pushbutton off

P — pushbutton on

r — timer off

R — timer on

l — LED

a — AND gate

A — NAND gate

o — OR gate

O — NOR gate

e — XOR gate (parity)

E — XNOR gate (parity)

h — XOR gate (one-hot)

H — XNOR gate (one-hot)

f — constant off (fixed)

F — constant on (fixed)

c — counter gate off

C — counter gate on

cCdtjkqQy — flip-flops and latches: SR, JK, D or T, optional asynch set/reset/enable

I — define IC

i — use IC instance

bB — ROM/RAM, predefined bits, encoders/decoders

M — multiplexer (mux, demux)

U — arithmetic logic unit (ALU), built-in mathematical operators

T — terminal screen/keyboard/ASCII/decimal/counter

D — dot-matrix display, RGB LED

N — note/noise (music, speaker)

K — kinetic, various misc components

zZ — tristate buffer

? — random bit generator

J — patch panel jack

g — global backplane wires

u(n) — directed backplane wires

= — bus (wire bundle)

0123456789 — mark colors, timings, indices, bus/backplane connections, alignment, IC ID, ALU op, LSB, sign, ...

$ — autonumber buses

@ — visible isolator, casing

# — extend device surface area

&%,VWXY — special compact wires/inputs/crossings