Why didn't the GQ-4x4 misread when retested?

The GQ-4x4 read every test chip bit-perfect across twenty-eight sequential reads on two USB ports, with and without an inline USB tester, on fresh and aged chips. None of the variables tested reproduced the Part 1 failure. Intermittent EPROM read faults can stop reproducing when conditions shift between sessions — that's the nature of the failure mode.

Does an intermittent EPROM read fault mean the chip is bad?

Not necessarily. An EPROM verify error tells you the programmer's readback disagrees with its buffer. The disagreement can be a bad chip, an incomplete burn, or the programmer misreading a good chip. Compare the chip against the original source file with a tool independent of the programmer — DOS fc /b is the simplest path.

What is the minimum viable EPROM cross-validation workflow?

Two reading sources and one binary compare. Burn the chip on one programmer, read it back on a different programmer (or the same programmer at a different time), and use fc /b to binary-compare the readback against the original source file. You need two independent reading sources, not five.

How do I tell if my EPROM programmer is misreading chips?

Read the same chip three times in a row, save three separate files, and fc /b them against each other. Different scattered errors each read indicates intermittent read electronics. Identical reads that differ from the source file indicates deterministic misreading. All matching reads indicates correct reading under current conditions.

Battlezone: the arcade tank the Army turned into a trainer

August 1, 2026

Atari 2600 running Battlezone TC on a CRT with two joysticks and a PlusCart+ cartridge.

Atari's 1980 tank game was the first true 3D arcade shooter — and the rare coin-op the U.S. Army commissioned its own military version of, to train real tank gunners.

There's a specific sound people who grew up in arcades still remember: the low mechanical rumble of a Battlezone cabinet, felt through the floor before you reached the controls. You leaned into the periscope hood, grabbed two sticks, and you were inside a tank on a flat green horizon — a volcano smoking in the distance, a slow moon rising behind it. Atari shipped it in 1980, and it's widely considered the first true 3D first-person game the arcade had ever seen.

This is the story of Battlezone — and of the one time the United States Army looked at an Atari coin-op and said: we want that.

The cabinet that put you inside the tank

Battlezone on a GlobalVR Global Arcade Classics multicade running on a raster CRT, emulating the original vector graphics.

Battlezone's wireframe look — here on a GlobalVR Global Arcade Classics multicade, rendered on a raster CRT. The 1980 original drew it on a true vector monitor.

Battlezone was designed by Ed Rotberg, and the trick that made it feel like nothing else was vector graphics — bright lines drawn straight onto a black-and-white monitor, with a green-and-red plastic overlay faking color. No sprites, no blocky pixels: clean glowing wireframe, redrawn fast enough to read as real depth. Tanks crept over the horizon, you swung the periscope view to track them, and the whole machine had a cold, tactical calm that most 1980 arcade games — all primary colors and bleeping aliens — didn't even attempt.

It was a hit. And it caught the eye of someone who wasn't shopping for a game.

The Army came calling

Bradley Trainer (Army Battlezone) in-game screenshot showing helicopters and missile ordnance.

The Bradley Trainer — helicopters, guided missiles, a gunnery yoke. Only one prototype was ever built.

Under a contract tied to the Army's training command, Atari was asked to turn Battlezone into a real gunnery trainer for the M2 Bradley Fighting Vehicle. The result — built quietly, never sold, usually called the "Bradley Trainer" or "Army Battlezone" — is one of the strangest artifacts in video game history.

Ed Rotberg got about three months to do it, and by his own account wasn't thrilled to be handed a military project at all. The redesign was serious. Out went the twin sticks; in went an adapted gunnery yoke that aimed across two axes like the real Bradley's controls. The tank stopped driving — a Bradley gunner doesn't steer the vehicle — so the player sat still and aimed. In came the actual ordnance the Bradley carried: helicopters to track, guided missiles, machine-gun fire.

Only one prototype was ever built. It was never released, never sold, and survives today as a kind of holy grail that surfaces at shows and in private collections. Rotberg, for his part, is said to have made it a condition that he'd never be asked to work on another military project — and he wasn't. He went on to design Major Havoc instead.

Where to actually play it

Battlezone scattered across hardware in ways that make a fun map. The arcade original is vector, and nothing at home in 1983 could touch that — so when Mike Feinstein ported it to the Atari 2600 that year, he had to throw out the first-person view entirely and rebuild it in third person. The 5200 version was further along and then cancelled in the chaos of the Tramiel takeover — a proper "what could've been." The Atari 8-bit got an Atarisoft release; the ST got a 1987 port that's interesting under the hood, because it emulates chunks of the original arcade 6502 code; and the Lynx got Battlezone 2000 in 1995, with a two-player Comlynx link. One bit of pub trivia for your back pocket: it never landed on the Jaguar.

That single-stick, third-person view was the compromise the 2600 hardware forced in 1983 — and the community eventually went back and fixed even that. A homebrew hack called Battlezone TC by Thomas Jentzsch restores true twin-stick control, using both of the 2600's controller ports the way the arcade did: push both sticks forward to drive, pull one back to pivot the treads. Load it onto a real 2600 — it's right there in the PlusCart+ PlusStore — plug in two joysticks, and you're steering the tank like it's 1980 again. (Two sticks with their snap intact help; one of mine needed a rebuild, which became a Bench Note of its own.)

PlusCart+ PlusStore menu on a CRT showing Battlezone TC, with an Atari 2600 and two joysticks.

Battlezone TC, right there in the PlusCart+ PlusStore — load it, plug in two sticks, and the arcade's tank steering is back.

And if you want the arcade original in all its glowing glory, it helps to know what made it glow. Battlezone ran on a true vector monitor — still a CRT, but a special kind that drew those lines directly, a moving electron beam tracing each shape, instead of scanning a grid of pixels the way the raster CRTs in ordinary TVs and most arcade cabinets do. That's the secret behind the impossibly clean wireframe, and it's why nothing quite matches an original cabinet. Emulations get you the shapes faithfully — Atari's modern compilations, MAME, and multi-game cabinets like the GlobalVR Global Arcade Classics — but they're drawing Battlezone as raster graphics on a standard raster screen (in my cabinet's case, a real CRT, just not a vector one). A true vector tube, if you're ever lucky enough to stand in front of one, renders it in a way a pixel grid simply can't.

And here in Chicagoland, you don't have to be all that lucky. When I'm craving that vector glow — a real Battlezone on a real vector tube — Galloping Ghost in Brookfield is a short drive: the largest arcade in the country, well over a thousand machines, every one of them on free play. A wall of original cabinets is the most persuasive argument for the real thing I know.

Original Atari vector arcade cabinets at Galloping Ghost Arcade — Battlezone with twin sticks at right, beside Black Widow and Gravitar.

Galloping Ghost in Brookfield — a real Battlezone, twin sticks and all, leading a row of Atari vector classics at Galloping Ghost: Black Widow, Gravitar, Space Duel, Major Havoc, and Tempest. The genuine vector glow, a short drive away.

Battlezone is one of those games whose legend outgrew the cabinet. It put players inside a tank, it put the Army inside an arcade — and forty-odd years on, the people who loved it went and rebuilt its controls so the rest of us could feel it the way the arcade did. Not bad for 1980.

Frequently asked

What was Battlezone and why is it significant?
Battlezone is Atari's 1980 tank game, widely considered the first true 3D first-person game in the arcade, designed by Ed Rotberg using vector graphics drawn on a black-and-white monitor with a colored overlay.

What was the Bradley Trainer?
The Bradley Trainer, or "Army Battlezone," was a gunnery trainer the U.S. Army commissioned Atari to build from Battlezone for the M2 Bradley Fighting Vehicle, replacing the twin sticks with a gunnery yoke; only one prototype was ever built and it was never sold.

How was Battlezone changed for the Atari 2600?
Mike Feinstein's 1983 2600 port had to drop the first-person view and rebuild the game in third person; a later homebrew hack, Battlezone TC by Thomas Jentzsch, restored true twin-stick control using both controller ports.

Why does the original Battlezone look different from home versions?
The arcade original ran on a true vector monitor that drew each line directly with a moving electron beam, producing clean wireframe that raster screens, which scan a grid of pixels, cannot fully match.