Retro Computing Archives

CRT burn in

Dave Farquhar Retro Computing December 16, 2020December 7, 2020

CRT burn in is a phenomenon where an image becomes permanently etched into a monitor’s phosphors. This causes the outline of the image to remain visible, even when the monitor is off. It’s a problem that we frequently find on vintage CRT monitors today.

Burn in is most frequently associated with CRTs, though it can happen with other display types. Modern technology usually mitigates burn in on newer displays, so burn in rarely happens with modern displays, such as LCD or LED displays.

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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Commodore 1084 monitor

Dave Farquhar Retro Computing December 10, 2020January 6, 2026

The Commodore 1084 monitor was Commodore’s flagship monitor, a monitor that worked with everything they produced in the late 1980s, including the C-64, the C-128 in 40 and 80 column modes, the Amiga line, and Commodore’s CGA-equipped PC clones like the Commodore Colt. Its versatility makes it popular with retro computer enthusiasts today. Not only does it work with almost any Commodore computer, it also works with a lot of non-Commodore computers.

Dave Farquhar

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Baking computer chips: Fixing chips in an oven

Dave Farquhar Hardware, Retro Computing December 7, 2020May 21, 2024

Does baking computer chips fix them when they’re broken? Can you fix computer chips in an oven? The answer is sometimes. Unfortunately, it’s difficult to know when it will help, and when it does, we may not know why. But, when faced with a broken chip, we don’t exactly have anything to lose, either.

Baking computer chips does seem to fix them, at least sometimes. Whether it works depends entirely on why the chip failed in the first place, which isn’t always possible to know.

Dave Farquhar

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Jonard EX-2 review: The best chip puller

Dave Farquhar Hardware, Retro Computing November 17, 2020October 31, 2020

If you’re looking for the best chip puller or IC extraction tool, I don’t think anyone will argue with my assertion it’s the Jonard EX-2. I finally picked one up this fall after watching various retro Youtubers use them for more than a year. The videos aren’t exaggerating. This chip puller makes life with retro machines much easier. This is my Jonard EX-2 review.

Dave Farquhar

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MOS 6522 replacement

Dave Farquhar Retro Computing November 12, 2020February 4, 2022

One question that comes up pretty frequently among vintage computer enthusiasts is what to use as a MOS 6522 replacement. Commodore used this chip extensively, but so did others. There are suitable replacements in the form of second-source 65c22 chips, but not all of them work. Here’s what to use.

Commodore went out of business in 1994, and started winding down its chip production as early as 1992. But some of its designs were available through second sources, and the 6522 was one of them.

Dave Farquhar

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Monitor stand for retro computers

Dave Farquhar Retro Computing November 9, 2020September 25, 2022

In the 80s, when all-in one computers like the Amiga 500, Apple IIc, Atari 520 and 1040ST, and Tandy 1000EX and HX were popular, monitor stands helped us keep our systems organized. It’s hard to find a monitor stand from the period now, but there’s an acceptable modern substitute, or you can make your own. If you make your own, you can make it suitable for 8-bit systems as well, letting you stack your disk drives next to a monitor with the system unit underneath.

Dave Farquhar

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Amiga Bridgeboard: The PC compatibility option

Dave Farquhar Retro Computing November 5, 2020April 15, 2026

A photo of someone’s newly acquired Amiga 2000 turned up on a vintage computing forum recently. It was sporting two 3.5″ drives, but also had a Chinon 5.25″ drive in its lower bay. Someone asked what the 5.25-inch drive was for. I responded it’s a good sign the system has an Amiga Bridgeboard in it. The Bridgeboard turns a big-box Amiga like a 2000 into an odd hybrid Amiga-PC clone.

First released in 1987, the Amiga Bridgeboard consisted of most of an IBM PC clone on a single full-length card. It had its own ISA bus, but it was also able to access some Amiga functionality, not just to provide IO but also to provide ways to share data between the two systems.

Dave Farquhar

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What is RS-232?

Dave Farquhar Retro Computing, Servers and Networking November 2, 2020March 19, 2024

Many vintage computers have RS-232 ports, and some current equipment does too, especially network switches. But what is RS-232? And why did it only partly fall out of favor? And what about RS-232C? I’ll try to clear up the confusion.

Dave Farquhar

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Composite vs S-Video

Dave Farquhar Retro Computing October 7, 2020June 20, 2025

Vintage computers and video game systems, as well as other consumer devices, often offer more than one video output option. Composite and S-Video are two of the most common options. Let’s look at composite vs S-Video, and why one is better than the other.

S-Video separates the video signal into two components, the chrominance (color) and luminance (brightness), where composite transfers them both on a single wire. Separating the two gives a clearer picture, though the difference depends on how the circuit is implemented.

Dave Farquhar

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How can market penetration be achieved?

Dave Farquhar Retro Computing October 5, 2020January 23, 2026

Being the best doesn’t make you the market leader. Being cheapest doesn’t either. What I’ve heard is that it’s usually the cheap enough, good enough solution that wins. But even that is an oversimplification. Here’s how market penetration can be achieved.

Dave Farquhar

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