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Commodore 64 Z80 cartridge

Dave Farquhar Retro Computing August 9, 2017April 3, 20231541, 1980s, 6502, apple, apple ii, commodore, commodore 64, intel, MOS, spartan

One of the most popular add-ons for an Apple II added CP/M compatibility. So I guess it should be no surprise that Commodore tried the same thing. But the Commodore 64 CP/M operating system and the associate Commodore 64 Z80 cartridge was a flop. Why?

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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Disadvantages of the 8086 microprocessor

Dave Farquhar Hardware, Retro Computing July 11, 2017August 11, 20176502, amd, apple, Apple Lisa, DEC, IBM, intel, MOS, motorola, x86

An 8086-series microprocessor, the 8088, powered the original IBM PC. Its direct descendants power PCs to this day. Not only that, they power modern Macs too. This was always controversial, especially running Mac OS on Intel chips. Why? What are the disadvantages of the 8086 microprocessor?

Dave Farquhar

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Commodore 64 models

Dave Farquhar Retro Computing June 12, 2017September 15, 20251541, 1980s, Aldi, amiga, apple, apple ii, atari, Australia, CES, commodore, commodore 64, compaq, IBM, infoworld, intel, Japan, MOS, nintendo, Personal Computer, public domain

Over the course of its 12 years on the market, Commodore released a number of Commodore 64 models. The computer’s capability changed very little over time, but the technology did. The world changed a lot between 1982 and 1994, and that gave Commodore some opportunities to lower costs, chase other market segments, or both.

Here’s an overview of the various Commodore 64 models that hit the market over the machine’s long life.

Dave Farquhar

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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

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Commodore 1541 vs clones

Dave Farquhar Retro Computing February 3, 2017November 15, 20241541, capacitors, commodore, MOS, power brick

The battle of the Commodore 1541 vs clones existed because Commodore’s early track record was rather imperfect.

Commodore’s 1541 floppy disk drive was the first consumer disk drive that cost less than $300, so it has an important place in computing history.

What some people forget is that while it broke new ground, its early owners loved to hate it. It was slow, it was loud, and ran hot. Early units were unreliable too. And to add insult to injury, in 1982 and 1983, Commodore couldn’t build them fast enough to keep up with demand. Even though it had problems, people were eager to buy it. (Disk drives for other computers tended to be problematic too, in this young industry.)

The 1541’s problems led to a number of clones that tried to be a little bit 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 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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Where Microsoft lost its way

Dave Farquhar Windows June 7, 2013July 9, 20171980s, 1990s, 6502, amiga, android, apple, apple ii, AT&T, atari, atari st, commodore, Digital Research, excel, IBM, IOS, Microsoft Basic, MOS, motorola, motorola 68k, nintendo, sony, unix, windows 8, windows me, xbox, XT

John C. Dvorak wrote an analysis of how Microsoft lost its way with Windows 8 this week.

All in all it sounds reasonable to me. His recollection of DOS and some DOS version 8 confused me at first, but that was what the DOS buried in Windows ME was called. But mentioning it is appropriate, because it shows how DOS faded from center stage to being barely visible in the end, to the point where it was difficult to dig it out, and that it took 15 years for it to happen. He’s completely right, that if Microsoft had pulled the plug on DOS in 1985, Windows would have failed. Read more

Dave Farquhar

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Steve Jobs and the Commodore PET

Dave Farquhar Retro Computing November 5, 2011October 11, 20171980s, 1990s, 6502, amiga, amiga os, apple, apple ii, Chuck Peddle, commodore, commodore 64, intel, irving gould, jack tramiel, KIM, macintosh, Mehdi Ali, MOS, motorola, pixar, Steve Jobs, Steve Wozniak, tape drive, Texas Instruments

There’s a nasty rumor floating around that in Walter Isaacson’s bestselling biography, Steve Jobs, Jobs alleges that Commodore copied the Apple II when making its first computer, 1977’s PET. Here’s the story of Steve Jobs and the Commodore PET.

The book doesn’t come right out and say it, but it insinuates it. I know how the PET came to be, and the PET would have happened whether the Apple II ever existed or not.
Read more

Dave Farquhar

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The little-known story of Commodore

Dave Farquhar Retro Computing June 9, 2007April 10, 20176502, atari, atari 2600, Chuck Peddle, commodore, intel, irving gould, MOS, motorola, stock scam

So I’m reading On The Edge, a longish book that tries to tell the story of Commodore properly, including the people who made it happen, and the companies it bought along the way.

I’m glad the story got told.

Dave Farquhar

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