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The Atari 2600 CPU: The MOS 6507

Dave Farquhar Retro Gaming May 29, 2017January 19, 20251980s, 6502, amiga, apple, apple ii, atari, atari 2600, Chuck Peddle, commodore, commodore 64, intel, jack tramiel, macintosh, MOS, motorola, NES, nintendo, nintendo nes, radio shack

The Atari 2600 CPU was a nondescript MOS 6507 chip. Neither Intel nor Motorola had a CPU chip in the early 1970s that could meet Atari’s price point. MOS Technology didn’t have one either, but they asked Atari what they could afford. Then they made one.

The 6507 is so nondescript, some of them don’t even have the number “6507” anywhere on them.

Dave Farquhar

David Farquhar is a computer security professional, entrepreneur, and author. He has written professionally about computers since 1991, so he was writing about retro computers when they were still new. He has been working in IT professionally since 1994 and has specialized in vulnerability management since 2013. He holds Security+ and CISSP certifications. Today he blogs five times a week, mostly about retro computers and retro gaming covering the time period from 1975 to 2000.

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Radio Shack computers

Dave Farquhar Retail, Retro Computing May 25, 2017February 5, 20251980s, 1990s, 6502, apple, apple ii, atari, Bill Gates, commodore, commodore 64, compaq, IBM, ibm pcjr, intel, Japan, Missouri, motorola, radio shack, Tandy, tandy 1000

Radio Shack released one of the first home computers, the TRS-80 Model I, in 1977. Between 1977 and 1979, it sold 100,000 units. Radio Shack sold them just as quickly as Tandy could make them. You can count Radio Shack and its parent company Tandy among computer companies that failed, but they enjoyed a good run. For a time, Radio Shack computers, later marketed as Tandy computers, were very popular.

Radio Shack and Tandy computers included the TRS-80 Model I from the inaugural class of 1977, the pioneering Model 100 portable, and the Tandy 1000 series, which helped bring PC clones into homes.

There were several reasons why Radio Shack computers were hard to compete with in the late 1970s and throughout the 1980s.

Dave Farquhar

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Commodore 64 vs Amiga

Dave Farquhar Retro Computing March 3, 2017September 6, 20181980s, 1990s, 6502, amiga, amiga os, atari, atari st, commodore, commodore 64, compaq, hp, intel, kmart, motorola, Packard Bell, Personal Computer, unix, XT

Looking at the Commodore 64 vs Amiga seems a little odd, at least to me. After all, the machines were never intended to be rivals. The Amiga was supposed to succeed the 64. Commodore bought Amiga because they couldn’t make a 64 successor on their own, so they intended for the Amiga to replace it. It didn’t fully succeed, and maybe that’s why the comparison is still interesting.

Looking back, the machines may seem similar today. But in 1985 they sure didn’t.

Dave Farquhar

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The old Montgomery Ward building in Kansas City

Dave Farquhar Retail November 4, 2016March 9, 20211980s, atari, Kansas City, marathon, matchbox, Meals, Mississippi River, Missouri

I remember the old Montgomery Ward building in Kansas City. I spent plenty of time in the sprawling complex at 6200 St. John Avenue in Kansas City near the intersection of Belmont Boulevard.

When I was growing up, the three most dreaded words in my (and my cousin’s) vocabulary were “Ward’s over town.” That was what our family called the monstrosity, which was home to a regional distribution center, an outlet store, a catalog store, and corporate offices in a mere 2 million square feet.

When we were eight years old, this store was where Saturdays went to die. I don’t know how many of its 2 million square feet were open to my mom, aunt, and grandmother to look for bargains, but there was plenty of room for bargains to hide, and if there was ever anyone willing to spend the whole day in that store stretching a dollar just as far as it could go, it was my aunt. Read more

Dave Farquhar

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Cleaning electrical contacts with Everclear

Dave Farquhar Retro Computing, Toy trains April 14, 2016October 26, 2021atari, nintendo, oxidation, toy train, video game

When I was 19 or 20, I paid a visit to my old grade school to do some computer repair. My fifth-grade teacher dropped in, saw me cleaning up the contacts on a circuit board, and asked why I wasn’t using Everclear. Cleaning electrical contacts with Everclear is, at least, a practice people talk about a lot.

Well, I couldn’t legally buy Everclear yet, for one thing. But let’s talk about why Everclear is good for cleaning electrical contacts but there are other things that can be better.

Dave Farquhar

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Commodore 64 vs VIC-20

Dave Farquhar Retro Computing December 7, 2015October 26, 20221541, 1980s, 6502, amiga, atari, atari st, commodore, commodore 64, jack tramiel, Microsoft Basic, MOS, power brick, public domain

How do you compare the Commodore 64 vs VIC-20?

The Commodore 64 and its predecessor, the VIC-20, look a lot alike, and the VIC-20’s design certainly influenced the 64. The 64 is the best selling computer model of all time, and I argue the VIC-20 was the first really successful home computer. The success of the two machines allowed Commodore to surpass Radio Shack as the sales leader in the computer industry. Yes, both Commodore and Radio Shack outsold Apple.

But even though the two machines are closely related, there are significant differences between them. It’s important to remember that in the 1980s, two years was a comparatively long time because the market was moving so fast. Plus, the VIC-20 was always supposed to be an entry-level machine. In 1982, the 64 was supposed to be fairly high-end. Let’s compare and contrast the two venerable machines.

Dave Farquhar

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How to connect a Commodore VIC-20 to a TV

Dave Farquhar Retro Computing November 23, 2015April 18, 20181980s, antenna, atari, atari 2600, commodore, RCA, video connector

Connecting old computers and consoles to not-as-old televisions is frequently a challenge. Sadly, the VIC-20, Commodore’s runaway bestseller from 1982, is no exception to that. Here’s how to connect a Commodore VIC-20 to a TV.

Unfortunately, there are fewer options for connecting a VIC than there are the slightly newer and more common C-64, but I’ll walk you through the options you do have.

Dave Farquhar

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Why were early computers beige?

Dave Farquhar Retro Computing November 12, 2015September 5, 20191980s, 1990s, apple, apple ii, atari, atari st, Benjamin Moore, Bennington Gray, commodore, commodore 64, IBM

It’s a common question: Why were early computers beige? In some ways it seems a curious color choice today.

Dave Farquhar

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Building DOS gaming PCs

Dave Farquhar DOS, Retro Computing August 10, 2015May 1, 20251980s, 1990s, amiga, atari, atari st, compaq, IBM, intel, macintosh, micron, Packard Bell, Tandy, tandy 1000, VGA, XT

The ultimate DOS gaming PC is a topic that I’ve seen come up in forums frequently, and that I’ve been asked directly a number of times. I guess since I published advice on running DOS games on Windows PCs on two continents, people figured I knew something about that. I guess I fooled them!

The trouble is that no single PC can really be the “ultimate” DOS game machine. Well, not if your goal is to be able to optimally run everything from early 1980s titles designed for the original IBM PC up to the last DOS version of Quake. I learned that the hard way in 1995 or 1996, even before Quake existed. Read more

Dave Farquhar

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How the Amiga could have lived to age 30 and beyond

Dave Farquhar Retro Computing July 25, 2015February 18, 20171980s, 1990s, amiga, amiga os, apple, atari, Bill Gates, commodore, commodore 128, commodore 64, IBM, intel, irving gould, jack tramiel, macintosh, Mehdi Ali, Microsoft Basic, MOS, motorola, nbc, os x

It was 30 years ago this week that Commodore released its landmark, long-time-coming Amiga 1000 computer–the first 1990s computer in a field full of 1970s retreads.

Yes, it was a 1990s computer in 1985. It had color and sound built in, not as expensive, clunky, hard-to-configure add-ons. It could address up to 8 megabytes of memory, though it ran admirably on a mere 512 kilobytes. Most importantly, it had fully pre-emptive multitasking, something that previously only existed in commercial workstations that cost five figures.

It was so revolutionary that even NBC is acknowledging the anniversary.

Being a decade or so ahead of its time was only the beginning of its problems, unfortunately.

Dave Farquhar

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