IBM 486SLC2 CPU: When a clone isn’t a clone

IBM 486SLC2 CPU: When a clone isn’t a clone

The 486 SLC2 is an oddball 486 chip made by IBM. It isn’t something anyone seems to talk about much, maybe because I’m the only one who finds its story ironic. It’s the story of a proprietary upgrade that found second life on clone motherboards. Except the clone motherboards were made by IBM themselves. If IBM made it, is it still a clone?

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How plastic can rust, sort of

How plastic can rust, sort of

Strictly speaking, plastic can’t rust. By definition, rust is iron oxide, the combination of iron and oxygen. But plastic can combine with oxygen and oxidize. It’s not rust by stretch definition, but it’s the same concept. Here’s why it can happen, and what you can do about it.

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Best retro network card

Best retro network card

What is the best retro network card? I will nominate the Intel 8/16 LAN Adapter. Depending on exactly what you need, there are other cards that can be just as good. And there are certainly faster cards. But the Intel 8/16 LAN Adapter is the most versatile. And it’s not terribly expensive.

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First generation IBM PC monitors

First generation IBM PC monitors

IBM produced and sold four monitors for the original IBM PC line. Yes, 4. These monitors were the familiar IBM 5151, IBM 5153, IBM 5154, and the obscure IBM 5175. In this blog post, I’ll explain these early and iconic IBM monitors for MDA, CGA, EGA, and the 5175, and how they relate to one another.

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386SX vs 386DX: a misunderstood difference

386SX vs 386DX: a misunderstood difference

The question of the 386SX vs 386DX is a confusing one. It always has been, even going back to when the chips were new. It doesn’t help that Intel wasn’t consistent. With the 386, SX vs DX has nothing to do with math coprocessors. It has everything to do with width of the data bus.

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Aztech sound cards: Underrated OPL3

Aztech sound cards: Underrated OPL3

Sometimes when you go through a pile of old parts, you find a diamond in the rough. An Aztech sound card is a great example. They sound like they ought to be standard fare ’90s junk, with poor compatibility and poor sound quality. But it turns out they have a genuine Yamaha OPL3 chip in them. They may be the cheapest way to get a real OPL3 left.

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286 vs 386SX

286 vs 386SX

The Intel 386 SX CPU quickly replaced the 286 CPU in the early 1990s. For a time, it was a very popular CPU, especially for people who were wanting to run Microsoft Windows. Yet the two CPUs run at nearly identical speed. So what was the big deal? The 286 vs 386SX argument could be confusing in 1991, and it’s not much clearer today.
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Apple Macintosh vs Lisa

Apple Macintosh vs Lisa

A coworker asked me what the difference was between the Apple Macintosh and the Lisa. Admittedly, it’s hard to compare and contrast the two. But the Lisa was more than just an expensive Macintosh. Let’s take a look at the Apple Macintosh vs Lisa.

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DOS boot menu explained

DOS boot menu explained

MS-DOS 6 introduced a boot menu capability, a capability PC DOS inherited. This capability had the potential to eliminate custom boot floppies, but not a lot of people used it in my experience. I have them set up on my retro PCs to good effect. So here’s the DOS boot menu explained, with useful examples.

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Commodore 64 replacement rubber feet

Commodore 64 replacement rubber feet

It happens on all old computers, and even some not-so-old computers. The rubber pads that sit on the bottom of Commodore 64s to protect the desk surface and keep it from sliding around can fall off, liquify, or otherwise go missing. But even though the last ever C-64 was built sometime in early 1994, you can still get Commodore 64 replacement rubber feet. Here’s how.

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