These tutorials are designed to help people of all abilities. Im starting off with a few basic examples and will be working up to some more complex ideas. If you have anything you would like to add to this page please email me. I will try to add both assembler and C versions of the examples.

Vertical Blanking Interrupt

This tutorial shows how to set up a vertical blanking interrupt. It uses this to implement a simple clock counter. It also uses the vertical blanking interrupt to handle a halt call to save battery time (more on this later). Other features of this example are; Graphics uploading, Memory clear, Screen enabling/disabling and Palette setting. If you have any questions about this or any other example please email me.

True Colour Fading

This tutorial shows how to fade between palettes correctly. It uses the distance between the current and wanted colours, divides it down for the number of steps required and then uses that as a step value . The advantage with this sort of fade routine is that all the colours will reach the wanted palette at the same time, giving a smoother fade. I am currently rewriting this code to make it quicker, smaller and easier to read but I thought id upload this version anyway. Please ignore all the extra code that is in this file as its not needed. Press any key to fade up and then down again. If you have any questions about this or any other example please email me.

Text Demo by Benjamin Goodrich

This tutorial shows off a number of techniques including screen use, joypad reading, vertical blank and video ram access. Well worth downloading and looking through. To contact him email Ben@nospam.Deathsgateway.com (case sensative - remove the no-spam),