Jeff Tranter's Blog

I added a couple of new features to my JMON machine language monitor program. I took the memory test code from here  and added a memo...

I just wrote a disassembler that runs on the Replica 1. I did it mostly for a personal programming challenge as there are lots of them arou...

The lack of a power on reset for the Replica 1 is a little annoying. After being powered on you need to press the reset button. This is f...

There is one more piece of hardware on the Replica 1 Multi I/O board that we haven't examined, the 6551 Asynchronous Communication Int...

In this last instalment of my series on the 6522 VIA we'll use a little more hardware to show how to generate analog waveforms using a ...

In this experiment we will play with interrupts and show how to implement a time of day clock using the 6522 VIA. Interrupts are a fe...

This time we're going to extend the pulse counting example from the last instalment to be able to measure frequency. The code is short ...