Platen

A thermal typewriter that never existed

I’d been obsessed with thermal typewriters for a while and wanted to make one. Not a copy of a real model, more like a game environment built around an ordinary writing app.

It mixes Canon’s Typestar, Panasonic’s Thermalwriters and the line display of Canon’s AP-1500. A line waits on the display, and when you press Return it’s printed for good.

It was also a test of building by direction. With Claude Opus 5.5 I worked in a loop: share references (photos, a recording of a real Typestar), ask for research first, react to each version, and decide what to cut. The chapters below are those decisions.

A world, not an interface

Games make a space feel alive with light, sound and objects that react. Productivity apps rarely try. I wanted a writing tool designed more like a game level than a settings screen.

In games, an interface that lives inside the world is called diegetic, like the health meter built into the suit in Dead Space. Here the display, the printed labels, the paper and the bin are the interface. Place helps memory too: in Microsoft’s Data Mountain study (1998), people found saved pages faster when they had arranged them in space themselves.

One body, not an assembly

One continuous shape, from the lip at the front to the raised cover at the back, with solid caps at the ends.

Before

Printed, not modelled

The shortcuts are printed on the body, and three controls move: the paper switch (Alt P), the line-space lever (Alt S) and the width dial (Alt W).

Line memory

A line waits here until you press Return, and you can edit it freely. The idea comes from the AP-1500, which held 31 characters. The dots follow the 5×7 grid of old LCD chips.

Before

The frosted ruler

A smoked plate over the print line. The head moves underneath, blurred, with the column scale on top.

Four ways to put a letter on paper

Typebars, type balls, daisy wheels and thermal heads each print differently, and each changes how the machine sounds and looks.

Before

The thermal head

A ceramic strip with 26 tiny heaters, as on the Typestar 7. It presses on, heats each letter as it crosses the line, then lifts and returns.

It holds heat, too. After a pause the first letters print lighter, and a fast run prints a little darker, so your rhythm shows on the page.

Film ribbon & cassette

An ink film runs from the cassette, around the head and back, and the reels turn as it’s used.

Courier, the old way

12-point Courier at 10 characters per inch, each letter slightly off and saved that way. Bold and underline are a second pass of the head, as a typist would do it.

Type and erase

In line mode you fix things on the display. In character mode, backspace lifts the letter off the paper with correction film, bold and underline included.

The platen

The rubber roller that holds the paper. Typewriters have had one since the 1870s, and the project is named after it.

Roll, fanfold, card

Paper comes up from below, wraps the platen past the head and leans back on a support, so printed lines move up and away from you.

Letting go

Ctrl X tears the page off and it falls to the desk. Tearing is the only way to save.

A desk that never ends

Pages collect on a desk with no edges, and stay where you leave them. Drag empty space to move around. Scrolling steps between four views, from the paper up close to an overhead view of every page.

Pick it up

Click a page to hold it up and read. From there you can copy the text, save a PNG with transparent torn edges, or throw it away.

Mark it up

Press M and draw on any page. V goes back to moving, Ctrl Z undoes.

The bin

Drop a page on the bin and it crumples in. Click a ball to take it back. Only Empty bin and Clear desk delete for good, and both ask first.

Tidy up

Alt T lays every page out in a grid, oldest first, one row per day.

What I left out

A 3D keyboard (you have one), the paper bail, screws and vents, paper jams, and folding pages, which I tried and removed.