Macintosh Classic CRT with modern linux computer – Part 3

Introduction

This is the final part of my series discussing my Macintosh Classic CRT project. In this article I want to give you a summary of my future ideas for the macdisplay project. I will write a dedicate article for each idea as soon as I finished it. The links to these articles will be in this one, so look at it as a table of contents. Continue reading Macintosh Classic CRT with modern linux computer – Part 3

Macintosh Classic CRT with modern linux computer – Part 2

This article will cover the software aspect of my Macintosh Classic project. The final solution is running on a BeagleBone Black, using it’s programmable realtime unit. If you want to learn more about PRU programming, you can do so here. If you haven’t done so already, I recommend you to read the other parts of this series. You can find the table of contents at the end of this article. Continue reading Macintosh Classic CRT with modern linux computer – Part 2

Macintosh Classic CRT with modern linux computer – Part 1

Introduction

This article will explain how the timing of the Macintosh Classic CRT works and how I tried (and failed) to interface it with the Raspberry Pi, and how I interfaced it with the BeagleBone Black’s PRU. This is a multipart series, you can find the table of contents, as always, on the bottom of the page. Continue reading Macintosh Classic CRT with modern linux computer – Part 1

Macintosh Classic CRT with modern linux computer – Intro

Almost one year ago I found an old Macintosh Classic, produced in the 1990’s in a basement. I bought it from the guy who used to own it and he told me, that he doesn’t know whether it is working or not and that it was standing there for about 20 years, so it was in a pretty bad shape. After it arrived at my apartment, I immediately plugged it in and switched it on. After the screen came on, it was pretty disappointing: It just displayed a checkerboard, which seems to be a pretty common issue with these models. This problem is caused by a variety of issues.

Continue reading Macintosh Classic CRT with modern linux computer – Intro

BeagleBone Black PRU clock cycle counter

Introduction

Today’s article will be a short one in which I’ll cover the so called cycle counter register (DWT_CYCCNT), which is present on the BBB’s PRU cores and on other CPUs from the Cortex architecture (See here). However this register is implementation dependent, so it might not be available on chips from some vendors. If this register is not present on a chip, it will always read zero. This register counts the number of cycles for which the PRU has been enabled. Continue reading BeagleBone Black PRU clock cycle counter

BeagleBone Black programmable realtime unit (PRU) Hello World – Part 2

Introduction

In this part of the series I’m going to show you how to write a very basic C Host-Application that will run a program on the PRU of the BBB. This part of the series assumes, that you have basic C skills. I’ll also include some useful links to the official ti API. All compiling can be done with the tools, that come with the BBB, no Code Composer Studio (CCS) oder Eclipse needed, but you can use them, if you want to. Continue reading BeagleBone Black programmable realtime unit (PRU) Hello World – Part 2

BeagleBone Black programmable realtime unit (PRU) Hello World – Part 1

Introduction

This part covers the device tree overlay for our little Hello-World Example. I will not cover linux device trees here or why they are useful, because other articles in the interweb already contain great articles about this topic. I will give you some links at the end of this page. Continue reading BeagleBone Black programmable realtime unit (PRU) Hello World – Part 1