Magic

Mouse (box tool)

Left: Move the box (its lower left corner) to the pointer
Right: Move the box's upper right corner to the pointer
Middle, Alt+left: Paint the layer under the pointer into the box (or erase on empty space)
Wheel: Scroll; Shift+wheel scrolls sideways; Ctrl+wheel or pinch zooms

Keys (with the pointer in a window)

:: Type a command (also the box below)
v, z, Z: View all, zoom in to the box, zoom out
s, a, i: Select under the box: paint, visible, cell
c, m, d: Copy, move, delete the selection
u, U: Undo, redo
?: Explain the DRC error under the box
Arrows: Scroll; Ctrl+arrows grow the box
space: Next tool

Window menus and toolbar

Each layout window has the Tcl/Tk wrapper's menus (File, Edit, Cell, Window, Layers, Drc, Options), a DRC switch, and the box or pointer position. Options opens the cell, library, technology and DRC managers, the netlist and colormap windows, a command entry for the window, and the crosshair.

Click a layer: Show it; right click hides it
Middle, Alt+click: Paint it into the box; Shift+middle erases
p e s S l u: With the pointer on a layer: paint, erase, select more, select less, lock, unlock

Simulation (IRSIM)

irsim [prm] [cell] extracts the cell if needed, writes its .sim, starts IRSIM (loaded only now) and gives you its irsim> prompt: h, l, s, d, ana and the other IRSIM commands. A cell whose supplies aren't named Vdd and Gnd needs them driven first, e.g. h VDD and l GND. Type . to return to Magic, where simcmd d applies an IRSIM command to the selection, watchnode labels the selected node with its value, and the rsim tool (space) shows node values on a middle click. q at the prompt quits IRSIM. Options > IRSIM has the analyzer and node lists.

Projects

Project > Open files or Open folder copies .mag files, a folder, or one .zip, .tar or .tar.gz archive into the page; you can also drop them on it. The cell that no other cell uses is opened. A .tech file in the project is loaded first; otherwise the technology the cell names (scmos is built in).

To keep your work, either work in a folder on disk (Chrome, Edge and other Chromium browsers: every file Magic writes, for example with File > Save All or the w key, goes straight into that folder) or keep the project in browser storage (any browser; private to this site). Both appear under Project > Recent next time. Otherwise files live in memory until you download them as .tar.gz.