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Commodore RAM expansion units

Dave Farquhar Retro Computing August 25, 2017November 10, 20181541, 1980s, 1990s, 6502, commodore, IBM, quantumlink, ram disk

The 6502-family CPUs in Commodore 8-bit computers famously used 64K of RAM at a time. But in 1985, Commodore introduced a cartridge that added up to 512K of RAM to the 128. Commodore followed up soon after with a 256K cartridge for the 64. How did Commodore RAM expansion units work?

Dave Farquhar

David Farquhar is a computer security professional, entrepreneur, and author. He started his career as a part-time computer technician in 1994, worked his way up to system administrator by 1997, and has specialized in vulnerability management since 2013. He invests in real estate on the side and his hobbies include O gauge trains, baseball cards, and retro computers and video games. A University of Missouri graduate, he holds CISSP and Security+ certifications. He lives in St. Louis with his family.

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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

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Where to buy vintage computers

Dave Farquhar Retro Computing June 28, 2017February 13, 20221541, 1980s, commodore, dell, electric trains, estate sales, garage sale, garage sales, IBM, ibm pcjr, intel, Kansas City, Missouri, recycling, survivors, Tandy, Texas Instruments, TI, Value Village, vintage computer, vintage trains

Collecting vintage computers can be fun. I also personally think it’s great that people are interested in preserving that history. Where to buy vintage computers hasn’t changed much over the years. It just may take a bit more work than it used to.

Some people think old computers are priceless. Others think they’re worthless. I don’t recommend wasting your time with people who think a Dell Pentium III laptop is worth $300. Think of the times you found a jewel for five bucks and keep moving.

Dave Farquhar

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Commodore 64 models

Dave Farquhar Retro Computing June 12, 2017October 19, 20181541, 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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Epyx Fast Load cartridge

Dave Farquhar Retro Computing May 12, 2017September 15, 20221541, commodore, commodore 64, tape drive

The Epyx Fast Load cartridge, released in 1984, was the first commercially successful Commodore 64 fast load product. Commodore’s 1541 disk drive was much slower than competing disk drives, so fast load cartridges became popular. While the Epyx product was first, and sold very well, it didn’t have the market to itself for long. Its developer, Scott Nelson, went on to produce other fast loader products as well.

Epyx Fast Load was a plug-in cartridge that replaced the Commodore 64’s stock ROM disk loading routine with a more efficient routine that was about five times as fast. The result was that software that normally took three minutes to load often took closer to 30 seconds with the cartridge.

Dave Farquhar

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Commodore 64 common questions and answers

Dave Farquhar Retro Computing April 14, 2017August 5, 20171541, 1980s, 1990s, Baby Boomers, commodore, commodore 128, commodore 64, estate sales, garage sales, irving gould, Japan, Korea

I hear a lot of questions about the Commodore 64 over and over again. Many of them don’t warrant a single blog post. So here’s a list of Commodore 64 common questions and their answers.

If you want to know when the Commodore 64 came out, how many Commodore 64s sold, who made the Commodore 64, where the Commodore 64 was made, is the Commodore 64 worth anything, are Commodore 64 games worth anything, or if you can still buy a Commodore 64, read on.

Dave Farquhar

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1541 vs 1541C

Dave Farquhar Retro Computing March 30, 2017October 22, 20221541, 1571, amiga, commodore, IBM

The dark beige/tan Commodore 1541 disk drive is rather well known. The lighter beige, almost white 1541c is more of a curiosity. The drives are closely related, but the difference is more than just the color. Let’s take a look at the 1541 vs 1541c.

Dave Farquhar

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Commodore 1541 vs clones

Dave Farquhar Retro Computing February 3, 2017November 28, 20181541, 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 1541-II DIP switches

Dave Farquhar Retro Computing September 21, 2016June 20, 20211541, commodore

Commodore’s 1541-II disk drive has a pair of DIP switches on the back to let you change its device number. DOS and Windows computers use drive letters to address its disk drives (usually A: and B:). Commodore used the numbers 8-11 to address them. Here’s how to set the 1541-II DIP switches so you can run more than one drive.

Dave Farquhar

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Commodore 1540 vs 1541 disk drive

Dave Farquhar Retro Computing August 25, 2016December 17, 20201541, commodore, FCC

The dark tan 1541 is the most common C-64 peripheral in existence. Its counterpart for the VIC-20, which looks exactly like it at first glance, is pretty rare. The 1540 vs 1541 is a fairly common topic among Commodore enthusiasts.

Dave Farquhar

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