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PODCAST

Advent of Computing

Welcome to Advent of Computing, the show that talks about the shocking, intriguing, and all too often relevant history of computing. A lot of little things we take for granted today have rich stories behind their creation, in each episode we will learn how older tech has lead to our modern world.

history

All Episodes

52:41

Episode 169.5 - Ben Zotto and the Story of Sphere...

Advent of Computing ·

2025/11/01

I recently had the chance to talk to Ben Zotto about his upcoming book: Go Computer Now! - The Story of Sphere Computers. It's all about an obscure machine powered by the Motorola 6800 that released in 1975. I figured it was the perfect faire for my audience. And... I really want to read this book! You can back the project over at kickstarter: http://kickstarter.com/projects/bzotto/go-computer-now-the-story-of-sphere?ref=ey52pt And find out more at Ben's sites: https://gocomputernow.com/,

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26:10

Episode 169 - Dellinger's Viruses

Advent of Computing ·

2025/10/26

In 1981 Joe Dellinger attempted to create the perfect computer program: a virus that spread silently. In 1982 a revision of that virus broke containment. It would have remained completely hidden if it wasn't for an obscure Apple II game. Today we look at the story and motivation behind that virus, and how it slipped into the sands of time. Or... did it!? The truth is if you have an Apple II it may be infected with Dellinger's virus! My main source:

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26:45

Episode 168 - Halt and Catch Fire

Advent of Computing ·

2025/10/19

Imagine a secret number that could be used to bring your computer to a screeching halt. In 1977 Gerry Wheeler discovered an interesting feature of Motorola's new 6800 microprocessor. There was a secret instruction that, if read, would cause the processor to stop working. He called this magic number Halt and Catch Fire, or HCF, and wrote a neat article about the operation. This was the first time the public would learn about the secret powers of HCF, but this isn't actually the beginning of

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27:25

Episode 167 - The Tape That Unwound Itself

Advent of Computing ·

2025/10/12

Have you ever had a computer do something you can't explain? Have you ever thought a machine had a mind of its own? In 1971 Met Life was faced with this exact conundrum. Their tape drives, for some reason, were throwing tape all over the floor every night. Systems were checked and no flaws were found, but every morning an operator would walk in on an absolute mess. What could make a healthy machine spit up it's precious tape?

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01:00:10

Episode 166 - Beyond the PDP-11

Advent of Computing ·

2025/10/05

My trilogy on the PDP-11 concludes with a look at the far flung places this computer can take us. In this episode we look at some issues with claims of the PDP-11's linage, smuggling, Hungarian-made microcode, and much more. Along the way we answer the question: if the PDP-11 was such a good design then where was it during the home computing boom of the 80s?

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54:48

Episode 165 - LSI-11

Advent of Computing ·

2025/09/21

This episode we continue my series on the PDP-11 by examining how DEC adapted to the advent of the microprocessor. Along the way we will see how the PDP-11 inspired new generations of computers, and the surprising connection to early digital hobbyists.

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52:03

Episode 164 - LGP-30 LIVE! from VCF West

Advent of Computing ·

2025/09/07

Last weekend I had the chance to talk about the LGP-30 and my emulation project at VCF West in Mountain View, CA. The showrunners will be posting a full video later, but that takes a while to go live. In the meantime, here's the audio I siphoned off the sound board and my slide deck. View my slides here: https://drive.google.com/file/d/1E9-B3EzxudFWX0yJMevbbIkD2qRbBKWi/view?usp=sharing View the emulator at: https://lgp30.org

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58:01

Episode 163 - Ever Heard of the PDP-11?

Advent of Computing ·

2025/08/24

The DEC PDP-11 is one of the most influential minicomputers of all time. Some would even call it the most influential computer of all time. But where exactly did it come from? How was it designed? This episode is the start of a 3 part series that will look at how the PDP-11 was created, adapted to changes, and the strange places it ended up.

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01:01:05

Episode 162 - CSIRAC, Australia's First Computer

Advent of Computing ·

2025/08/10

In 1949 CSIRAC sprung to life in a lab in Sydney, Australia. It was a very early stored program computer. All machines of the era were unique. But CSIRAC, well, it was very unique indeed. Selected Sources: https://cis.unimelb.edu.au/about/csirac/music/reconstruction - The Music of CSIRAC https://sci-hub.se/10.1109/MAHC.1984.10014 - Pearcy and Beard on CSIRAC

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01:03:18

Episode 161 - The IAS Machine

Advent of Computing ·

2025/07/13

The first batch of digital computers emerge directly following WWII. The hallmark of this generation is uniqueness: no two computers are the same. However, there is a machine that bucks that trend. The IAS Machine, built in Princeton in the late 1940s, served as the inspiration for at least a dozen later computers. But how similar were these Princeton-class computers? What exactly was so special about the IAS Machine? And how does good 'ol Johnny von Neumann get tied up in all of this? The Eastern

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56:28

Episode 160 - What can Lunar Lander tell us about FOCAL?

Advent of Computing ·

2025/06/29

Lunar Lander is one of the best loves video games of all time. The game was created in 1969 as an homage to the recent Apollo 11. From there it would only spread. Just about anything that can print text has it's own version of Lunar Lander. The early history of this game is mixed up with something weird: two nearly identical programming languages. Today we will be using the history of Lunar Lander as a good excuse to look at an obscure tongue called FOCAL. This language is so close to BASIC that

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01:06:40

Episode 159 - The Intel 286: A Legacy Trap

Advent of Computing ·

2025/06/15

In 1982 Intel released the iAPX 286. It's was the first heir to the smash-hit 8086. But the 286 was developed before the IBM PC put an Intel chip on every desk. It's design isn't influence by the PC. Rather, it reaches further into the past. Today we are looking at the strange melding of old technology, new ideas, and compatibility that lead to the 286.

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01:08:22

Episode 158 - INTERCAL RIDES AGAIN - Restoring a Lost...

Advent of Computing ·

2025/06/01

In 1973 the world caught it's first glimpse of INTERCAL. It's a wild and wacky language, somewhere between comedy and cutting satire. But the compiler was never circulated. There would be later implementations, but that original compiler remained lost to time. That is, until now. This episode covers how the original source code was found, and my attempt to get it up and running. Get the source code for INTERCAL72 here: https://github.com/rottytooth/INTERCAL72/ Read the original INTERCAL manual:

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01:04:40

Episode 157 - Only S1 Users Will Survive!

Advent of Computing ·

2025/05/11

The S1 operating system can do it all! It can run on any computer, read any disk, and execute any software. It can be UNIX compatible, DOS compatible, and so, so much more! But... can S1 ship? Today we are talking about an operating system that sounds too good to be true. Is it another example of vaporware? Or is S1 really the world's most sophisticated operating system?

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01:04:10

Episode 156 - RPG, a Different Paradigm?

Advent of Computing ·

2025/04/27

How do you make a computer act less like a computer? It sounds like some kind of riddle, but in the early 1960s it was an actual problem. As IBM customers transitioned from tabulators to computers they ran into all sorts of practical issues. Programmers became a hot commodity. But how do you find a programmer in 1959? And how can you even afford such a luxury? Wouldn't it be better if you could just use your new computer as a tabulator? Well, with RPG, all that and more was possible.

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58:21

Episode 155 - LINC

Advent of Computing ·

2025/04/13

In the early 1960s a neat little machine came out of MIT. Well, kind of MIT. The machine was called LINC. It was small, flexible, and designed to live in laboratories. Some have called it the first personal computer. But, is that true? Does it have some secret that will unseat my beloved LGP-30? And how does DEC fit into the picture?

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01:20:48

Episode 154 - ACTing Up

Advent of Computing ·

2025/03/30

The LGP-30 is one of my favorite computers. It's small, scrappy, strange, and wonderous. Among its many wonders are two obscure languages: ACT-I and ACT-III. In this episode we are exploring the ACTS, how the LGP-30 was programmed in practice, and why I've been losing sleep for the last few weeks.

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55:07

Episode 153 - The Keypact Mystery

Advent of Computing ·

2025/03/17

When I was down at VCF SoCal I ran into a strange machine: the Keypact Micro-VIP. It's a terminal without a keyboard, covered in dials, with a speaker and a switch labeled "voice". This chance encounter with the unknown sent me down a wild path. It involved the creeping spread of computing, chicken feed, door to door life insurance salesmen, and at least one early hacker.

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01:00:06

Episode 152 - LIVE at VCF - Reviving Retro Panel

Advent of Computing ·

2025/03/02

A special treat from VCF SoCal. While visiting I had the chance to host a panel on restoration and preservation. I was joined by: David from Usagi Electric (https://www.youtube.com/@UsagiElectric) Rob from Souther Amis (https://www.southernamis.com/) Jim, Former Executive Director Computer Museum of America (https://computerhalloffame.org/home/about/)

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01:00:33

Episode 151 - The Friden Flexowriter

Advent of Computing ·

2025/02/03

Have you ever looked at an old computer and seen a weird typewriter thing tacked on? In most cases that's a device called a Flexowriter. It's half electric typewriter, half teleprinter, half tape reader, and all business! This episode we are chronicling the rise, fall, and weird business dealings of the Flexowriter.

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