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IBM 5170 battery

Dave Farquhar Retro Computing December 8, 2021March 9, 2024

Long ago, if you needed an IBM 5170 battery, you could drive 5 minutes to Radio Shack and they would have one. It might cost $10, but the time you saved was probably worth it. But those batteries disappeared sometime around Y2K, and of course Radio Shack has been gone nearly a decade now too. Here’s how I cobbled together a suitable IBM 5170 battery for around $6.

This battery was something of a standard, so a lot of motherboards, even into the 486 era, had a connector for this type of battery. So it’s useful for more than just an IBM 5170. If you have a 4-pin battery connector on your board, chances are this solution will work on it too.

Mouse moves with arrow keys? The fix

Dave Farquhar Windows December 7, 2021April 1, 2023

My Windows mouse cursor was moving on its own on my work laptop and driving me up the wall. Here’s how I traced the problem and how I fixed it. It turned out the mouse cursor was moving when I pushed the arrow keys. I’ve seen this happen in both Windows 10 and Windows 11. The obscure problem where keyboard arrows move the mouse is easy enough to fix, fortunately.

Two things can cause the Windows mouse cursor moving with arrow keys. Those are an obscure feature called Mouse Keys, or the venerable Microsoft Paint app.

Brains 25 cents: The story behind the meme

Dave Farquhar St. Louis December 6, 2021May 29, 2023

There is a popular photograph of a rundown urban building with a painted sign that says “Brains 25 Cents” with an arrow and words “drive in” pointing toward the back of the building. What’s the story behind the sign?

The “Brains 25 Cents drive in” painted sign was on the second story of Harvey’s Sandwich System, a diner at the corner of Chouteau and Carr Lane Avenue in St. Louis. The restaurant closed in 1976, the sign was demolished in 1983 or 1984, and the building was demolished in 1993.

How big is an N scale train?

Dave Farquhar model railroading December 2, 2021November 20, 2021

N scale is the second most popular scale for model railroading, because it’s small enough that you can fit a big layout in a reasonable space without it taking over your basement, or build a small layout in a very small space, as small as a coffee table. But how big is N scale? How big is an N scale train?

Why does my wifi say not secure?

Dave Farquhar security December 1, 2021November 28, 2021

Sometimes, if you get a new device, or if you connect to a network you’ve never connected to, you can receive a message that says your Wi-Fi is not secure. Why does my wifi say not secure? Here’s why, and also why you shouldn’t ignore that message.

That message got your attention, didn’t it? It’s designed to get your attention. And it’s really easy to dismiss it as being alarmist. People have a tendency to either greatly overestimate or underestimate how much interest someone might have in attacking them. Especially if I tell you that the security that you’re getting a warning about has much more to do with privacy than it does with viruses. That message does not mean that this network is any more or less likely to infect you with a viruses.

But you need to do something about it when you see this message. First let me tell you why, then I will tell you what you need to do.

Install Windows 11 on an unsupported CPU

Dave Farquhar Windows November 30, 2021April 26, 2025

Ever since Microsoft announced Windows 11 would have much stricter hardware requirements than its predecessors, people who don’t want to go and replace all of their computers have been looking for work arounds. Here is the easiest way to install Windows 11 on an unsupported CPU, including virtual environments like VMware or Virtualbox. No need to edit files, mess with an ISO file or disk image or Rufus or the registry editor.

The easiest way to install Windows 11 on an unsupported CPU is to delete one file, appraiserres.dll, from your installation media. This trick will hopefully keep some usable computers out of landfills a little while longer.

Scroll lock on laptop

Dave Farquhar Hardware November 29, 2021November 28, 2021

Scroll lock is an obscure key that has mostly outlived its usefulness. Size-constrained laptops often omit the key, layering it with some other key combination that you generate by pressing the FN key plus a second key that varies. Here’s how to get scroll lock on a laptop when your keyboard doesn’t have the key.

Usually to get scroll lock to toggle, use the FN key and a combination of a second key, often C, K, S, or even F12. You can also use the Windows on screen keyboard.

Don’t use vape fluid in your Marx smoke unit

Dave Farquhar Toy trains November 25, 2021October 22, 2022

Someone sent me a YouTube video talking about using vape fluid in Marx smoke units as an alternative to using mineral oil. Here’s why vape fluid in your smoke unit is a terrible idea in any train, whether Marx, Lionel, or modern.

Floppy drive pinout

Dave Farquhar Hardware November 24, 2021November 20, 2021

You probably came here looking for the standard 34 pin floppy drive pinout, as used on most PCs. However, the PC floppy drive pinout was derived from a standard created by shugart in the 1970s, and More than one version of that pinout exists today. So let’s talk about the common floppy drive pinout, and the variance that you might see in your retro adventures.

Abandoned castle in Oakville, Mo.

Dave Farquhar St. Louis November 23, 2021December 4, 2022

The existence of an abandoned castle in Oakville Mo. will either be the most obvious thing in the world to you, or an absurd thought that would never cross your mind. And yet, behind Bee Tree Park, abandoned in the woods, there are, or were, ruins of a Scottish castle overlooking the Mississippi River that dated to the 1920s that was never finished.

Oakville had an abandoned hospital in the woods on the north edge of town. So why not an abandoned castle in the woods on the opposite end of town?