Sweet 16 (The 6502 Dream Machine) Ported to the VIC-20

Sweet 16 was created by Steve Wozniak to reduce code size and make it easier to handle 16-bit pointers and arithmetic for his Apple Integer BASIC. He wrote it around 1977 and referred to it in an arti...   Read More

Position Independent Code (6502) on the Commodore VIC-20

If we are writing 6502 machine code and want to to create a routine or program that can be placed in any location then we have to create Position Independent Code (PIC) or make the code relocatable. H...   Read More

Adding Basic Stubs to Assembly Language on the Commodore VIC-20

To make machine language programs more friendly it's nice to add a Basic stub which contains a line with a SYS statement to start the code. This is easy to do on the VIC-20 and the process gives you a...   Read More

Hand Assembling to Machine Code on the Commodore VIC-20

I quite enjoy designing machine language routines on paper and then hand assembling them. For many people this would have been their only option until they got a more advanced machine language monitor...   Read More

Changing Screen Dimensions on the Commodore VIC-20

To make the most of the limited amount of memory on the VIC-20, we can increase and decrease the screen size depending on our program's priorities and what we want to achieve. If we increase the size ...   Read More

Moving the Picture Origin on the Commodore VIC-20

The VIC-20's VIC chip provides a simple yet flexible video display and one of the features that can be quite useful is the ability to alter the picture origin on the screen. This feature allows us to ...   Read More

Spreadsheets on the Commodore VIC-20

The VIC-20 had a number a spreadsheet programs released for it which despite the limited resources of the Vic could actually be quite usable. The two best known are SimpliCalc and PractiCalc, but ther...   Read More

40 Columns in Basic on the Commodore VIC-20

There are a number of programs that allow you to use 40 columns of text from Basic on a Commodore VIC-20. This can be useful as by default the Vic's screen is 22 columns by 23 rows. They are supplied...   Read More

Creating a TTY Simulator in Assembly Language on the VIC-20

The Vicmon machine language cartridge is an excellent tool for exploring the Vic-20. This article and its associated video will show you how to use it to create a simple program that will change the n...   Read More

Beginning Assembly Programming on the Commodore VIC-20

The Commodore Vic-20 is a great machine to learn an assembly language on. It was released in 1981 and was the first computer to sell one million units, which contributes to its popularity today. The ...   Read More

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