David L. Farquhar on technology old and new, computer security, and more
On March 8, 1983, IBM released the follow up to its very successful IBM PC. The new model was called the PC/XT and it carried the model number 5160. “XT” stood for “eXtended Technology.” It offered greater expandability than the original PC, but improvements in speed and memory capacity had to wait for the next model, the 5170 PC/AT.
On March 7, 1983, one of the greatest New Wave songs of all time was released. And it shipped in an unusual record sleeve shaped like a floppy disk, complete with cutouts so the record could show through like the floppy part of an 8- or 5.25-inch computer disk. The song was Blue Monday by New Order.
Remember the Michelangelo virus? If you don’t remember, on March 6, 1992, Michelangelo was programmed to overwrite the first 100 sectors of a hard drive–not quite as destructive as formatting a drive, but to the average user, the effect is the same. It was a huge scare–John McAfee predicted five million computers would be affected–but largely was a non-event.
Those of you studying for security certifications would do well to remember that Michelangelo is a prime example of a virus and a logic bomb. Viruses replicate; logic bombs do something when an event triggers. Malware doesn’t always fit neatly into specific categories–crossovers are common.
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The Homebrew Computer Club was a legendary early computer hobbyist group in Menlo Park, California. The book Fire in the Valley and the 1999 movie Pirates of Silicon Valley describe the group’s pivotal role in the computer industry. Its first meeting was 51 years ago this week, on March 5, 1975.
The Intel 486DX2, introduced March 3, 1992, was the first clock-multiplied x86 CPU. It was a clock-doubled version of the earlier 486 CPU. A DX2 ran at speeds of 50 or 66 MHz, using a 25 or 33 MHz front side bus. It was pin-compatible with the earlier 486 CPUs, using the same 168-pin socket, but the use of a clock multiplier let it run at double the clock rate, yielding a 50-70 percent speed improvement over running the CPU at the bus speed. Much of the speed gain came from taking advantage of the 486’s on-die 8KB L1 cache.
The 50-MHz Intel486 DX2 cost $550 each in 1,000-pieces quantities at the time of introduction.
There is a popular misconception that AMD wasn’t good at cloning Intel CPUs. This is largely based on the observation that Intel released its 386 CPU in 1985, and AMD didn’t counter with its Am386 clone until March 2, 1991, nearly six years later. In this blog post, we will explore what took AMD so long, and how that delay played into future AMD CPUs.
GEM was an early GUI for the IBM PC and compatibles and, later, the Atari ST, developed by Digital Research, the developers of CP/M and, later, DR-DOS. (Digital Equipment Corporation was a different company.) So what was it, and what happened to GEM?
It was very similar to the Apple Lisa, and Apple saw it as a Lisa/Macintosh ripoff and threatened to sue. While elements of GEM did indeed resemble the Lisa, Digital Research actually hired several developers from Xerox PARC.
DRI demonstrated the 8086 version of GEM at COMDEX in 1984, and shipped it on 28 February 1985, beating Windows 1.0 to market by nearly 9 months.
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26 years ago this week the Pentium III launched. It was noteworthy for being the CPU that broke the gigahertz barrier, but also for being a better chip than its successor. The Pentium 4 clocked higher, but a Pentium III at 1.13 GHz outperformed a Pentium 4 at 1.5 GHz. It wasn’t really until the Pentium 4 doubled the speed of the Pentium III that the P4 became a good CPU.
Legendary game designer Sid Meier was born February 24, 1954. After creating a run of popular flight simulators in the early and mid 1980s, he shifted to strategy games in the second half of the decade, creating some of the greatest strategy games of all time in the late 1980s and into the 1990s.
For about three decades, Fry’s Electronics was the go-to computer store for enthusiasts, almost an Ikea of computer stores. It was a big box store, larger than Comp USA, selling not just software and pre-built computers and peripherals, but also parts, and even discrete components. So what happened to Fry’s Electronics?
The chain peaked at 34 stores in nine states. So that means a significant part of the population never got to set foot in one. But it took on mythic status thanks to computer magazines and the Internet. Byte columnist Jerry Pournelle would write about computers he built cheaply from parts he bought at Fry’s at “prices so low, they might as well have been giving it to me.”