Usually you’d attach a disk image to the VICE emulator and load one of several files from your virtual disk. Occasionally though you’ll come across single files ending in .PRG – those are the files that are contained on a disk image. Remember those weird three letter abbreviations on the right hand side when you … Read more
The C128 could run twice as fast as its predecessor, the legendary C64. All you had to do was issue the FAST command, or switch back with the SLOW command to its default speed (1MHz). One drawback of using FAST mode was that the VIC which powered the 40 column (standard) display wasn’t capable of … Read more
The C128 had various chips to display different kinds of graphics that man just stuck to the standard 40 column text display for “ease of use” and let their software handle the rest. To appreciate why these modes existed one had to understand what was happening behind the scenes. Here are the various modes and … Read more
In this screencast I’ll show you how to embed YouTube and Vimeo videos into your WordPress posts. There’s no need to copy and paste code snippets and position them anymore, thanks to a technology called oEmbed (sometimes called auto embed). WordPress parses the URL to your videos and adds the code needed to display those … Read more
The C64 can display two sets of fonts: either a combination of upper case and lower case letters (good for any kind of text), or a combination of upper case letters and graphics (default), known as PETSCII characters. In direct mode you can switch between the two by pressing CBM+SHIFT (i.e. The Commodore Key and … Read more
To set the background colour on your beloved old C64 (and C128 in 40 column mode) you have to POKE the colour value into two registers, one for the background and one for the border. The poor little guy only had 16 colour values, 0 for black, 1 for white, etc. To change the background … Read more
Sometimes it’s helpful to store large amounts of data on the disk rather than keep in it memory. Consider adventure games for example: you could add room descriptions to your listing and later read it into memory – but this would double the amount of memory you really need to keep the data. Since there’s … Read more
The 1541 Floppy Drive was equipped with its own MOS 6502 chip and was therefore capable of understanding and executing its own commands (to format the disk, copy files, erase files, etc). The idea was that it could operate autonomously without the attached C64 to get involved – revolutionary at the time. They were called … Read more