Display

Inputs

Outputs

This element has no outputs.

How It Works

The Display is a panel you can screw onto any wire of your circuit. Connect the D input to a signal — and the panel instantly shows its current value: zero or one. It is a digital voltmeter: it changes nothing, it just honestly reports what is happening on the line.

The key property: the same value can be seen in three number systems — decimal, binary and hexadecimal. Switching is a double-click on the element: dec → bin → hex → back to dec. For a single bit it looks like this: 1 in decimal, 0b1 in binary, 0x1 in hexadecimal. The habit of reading one signal in different formats will pay off when multi-bit buses arrive in the Verilog part.

A nuance: the Display has no outputs — it cannot pass anything along and serves purely for observation. That is exactly what makes it perfectly safe: stick it at any point of the circuit, and it will not affect signal propagation or the level's test results in any way.

Mode and Value Examples

Typical signals to watch: the ALU's Zero flag — a one means the computation result is zero; the clock signal — the panel blinks 0 ↔ 1 with every tick; the output of any gate — an instant check of its truth table.

Usage

The Display is a universal debugging tool, available on every level and in the sandbox. Classic connection points: the decoder's outputs (RegLoad, MemWr, JumpCond) — you instantly see which control signal is active; the ALU8's Zero flag when debugging conditional jumps; individual bus bits through a Splitter, when you need to know exactly what is "riding" inside the byte.

A concrete trick — tracing: place several Displays along the path of a signal and step through the simulation. You immediately see at which segment the signal is lost or inverted. Paired with LED8 you get a full observation kit: the Display watches single bits, the LED8 watches whole bytes.