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Altair 8800 Clone: A near-empty box filled with history


July 6, 2013

The Altair 8800 Clone reproduces the functions and flaws of the original

The Altair 8800 Clone reproduces the functions and flaws of the original

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Owning a piece of computer history can be expensive and not much fun. You can buy a vintage MITS Altair 8800, one of the world’s first successful desktop computers, on eBay, but a good one will cost you over US$4,000. That’s why computer enthusiast Mike Douglas developed the Altair 8800 Clone. It’s a modern, inexpensive, functional reproduction of the historic Altair 8800 computer that uses 21st century technology to recreate a bit of computer history for hobbyists and educators.

When the MITS Altair 8800 hit the market in 1975, it was as if NASA started giving away Apollo space capsules. In those days, computers were still things that even people who worked with computers had trouble getting access to. They were large, expensive and still rare enough that you had to book time on them for even the simplest job. The MITS company of Albuquerque, New Mexico used the newly-developed Intel 8080 processor to change all that when it used the microchip as the basis for the Altair 8800, a computer that could sit on a tabletop and sold for only $621 assembled.

The computer featured on the cover of the January 1975 issue of Popular Electronics wasn't the first hobby computer, but it was the first that came as a complete kit instead of list of parts or, also a first, fully assembled and tested. Exactly how many were sold isn't known, but it's estimated over 2,000 were delivered into the hands of consumers and the Altair 8800’s computer bus became the defacto industry standard.

Today, all this is surprising when a computer can be plugged in and connected to the internet in a matter of minutes of unpacking. To modern eyes, the Altair 8800 looks incomprehensible. There’s no keyboard, no monitor and the first ones didn’t even have any ports. It was just a blue and white box measuring 7 x 17 x 17.5 in (17.7 x 43.1 x 44.4 cm) with rows of switches and LED lights on the front panel marked with cryptic labels such as “HLTA” and “WO.” It ran on undiluted machine language and programming it was a long, tedious process of flipping switches to input binary code. It was also prehistoric in performance with 64 K of RAM and a CPU running at 2 MHz. Then there was the fact that assembling the kit was a long, difficult job.

Despite all this, MITS couldn’t keep up with demand and some buyers camped in the company’s car park waiting for their machines. After they got their machines assembled, the enthusiasts would then rack their brains trying to figure out what to do with the things. Meanwhile, a company called Traf-O-Data offered to write a new version of BASIC as the operating system for the Altair 8800. The partners behind Traf-O-Data went on to start an obscure software company called Microsoft.

The Altair 8800 Clone was started by Mike Douglas in 2012 when he discovered how much it would cost to buy a vintage Altair 8800. Even reproduction kits were expensive and hard to obtain, so Douglas decided to use the original data sheets and schematics to design his own replica with modern technology to emulate the original Altair 8800. The result was the Clone, which looks and acts like the original, but the inside is made of 21st century components. What started as a hobby became a business because producing things like custom casings or nameplates is only feasible when done in commercial runs.

The Clone duplicates the look, feel, features, and performance of an Altair 8800 down to the limitations and quirks, and it will run software written for the Altair 8800. This has a strong educational and nostalgia factor because, for all its historic significance, the Altair 8800 had some real design problems. The only thing the Clone can’t do is play “The Fool on the Hill” over an AM radio as an early Altair 8800 was famously programmed to do. That’s because the modern parts don’t bleed radio emissions, so they can’t be manipulated to play songs on a receiver.

The most obvious difference between the Clone and the Altair 8800 is that the former is suspiciously light. The modern components are so small compared to the original that the the power supply, circuit boards and buses have been replaced with a whole lot of nothing. At first glance, it looks like an empty box with a few wires running between the front and back panels. The case itself is an original design to emulate the Altair 8800s, though simpler inside to keep down construction costs.

The other difference between the Clone and the earliest Altair 8800s is that it has two external RS-232 serial ports as well as provisions for a printer and cassette interfaces if the user wishes to make modifications. Floppy drives for an Altair 8800 are harder to come by than the computer, so the Clone emulates these with virtual drives that allow users to “insert” a virtual disc using a PC. Once this is done, the Clone can emulate a floppy disc boot up without being reconnected to the PC.

Like the original, the Altair 8800 Clone is available fully assembled or in kit form. In addition, there are online tutorial videos and documents for using the hardware and how to program it. According to the company, the kit takes only a few hours to build, but recommends this only for those who have experience soldering circuit boards.

The Altair 8800 Clone sells for $621, which is the same price as an original assembled Altair 8800 in 1975. Oddly, the price for the kit version is the same because it turned out to actually be cheaper to offer the Clone assembled.

The video below is a technical introduction to the Altair 8800 Clone control panel.

Source: Altair 8800 Clone via classiccomputing.com

About the Author
David Szondy David Szondy is a freelance writer based in Monroe, Washington. An award-winning playwright, he has contributed to Charged and iQ magazine and is the author of the website Tales of Future Past. All articles by David Szondy

I thought my 1982 Kay-Pro II 'suitcase' was old ! It still works and I actually have some CPM manuals and software for it.

I also have a 1983 Compaq 'Portable' (?). It looks like a suitcase too and weighs 28 pounds.


My Kim-1 was more portable and could be battery powered!

Sam Joy

Well, 01001000 01000101 01001100 01001100 01001111 there! This is precisely the computer (an Altair "Blinken' box") we had to assemble at Malaspina College in electronics technology in the late 70s.. and yes it was 600 something bucks, and ALL in binary. No monitor (Apples could use monitors at the time, how radical!) Boy oh boy gotta love binary...


There are 10 types of people in the world, those who understand binary and those who don't. :)

It reminds me of the Heath Kit computers where one does all the soldering.

For me, I would be one to have something that looks like an old computer but has totally modern internals; like some of the projects at the Mini-Itx site.


I believe the first complete kit computer with full I/O was the Sphere not MITS altair.


Scott Adams www.msadams.com


I really like the way the Altair 8800 clone can also have a PC motherboard inside. That's PC case that will turn some heads.


Correct me if I'm wrong, but it was Micro-soft, not Microsoft...

Bob Laughlin

What useful purpose can a computer with not even a text display serve?


@MrGadget Of what use is a newborn babe?

Clare Love

Mr Gadget, the blinking lights ARE the output (need to interpret sequence of lights). This was mostly used as a logic controller (to control external devices based on variable inputs etc). The computers on the Apollo missions etc had no monitors, they were the brains behind all the components.. certain input data comes into the 'computer' and based on the input, the computer controlled the devices in a particular way.. the way the devices reacted could be 'programmed' into the computer

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