Building a Replica Final Cartridge III

The Commodore 64 was the computer of the 8-bit era, and remains the highest selling computer of all time. In addition to disk and tape drives, it also had a cartridge interface. A popular extension cartridge was the Final Cartridge III, which offered a variety of disk utilities and a GUI. [Greisi] was in possession of a no longer functional cartridge, and decided to reverse engineer the device.

[Greisi] started by desoldering all the ICs and mapping out a schematic for the board. The design centers around common parts for the era, such as a UV-erasable EPROM and some 74-series …read more http://pje.fyi/PCZfkc

Paul Jacob Evans

The Modern Retrocomputer: An Arduino Driven 6845 CRT Controller

[MmmmFloorPie] revived an old project to create the retro mashup of a 6845 CRT controller and a modern Arduino Uno. When it comes to chips, the Motorola 6845 is the great granddaddy of Cathode Ray Tube (CRT) interfaces. It was used in the IBM Monochrome display adapter, the Hercules graphics controller, CGA, Apple II terminal cards, and a host of other microcomputer and terminal systems.

Way back in 1989, [MmmmFloorPie] was a senior in college. His capstone project was a 68000 based computer which could record and playback audio, as well as display waveforms on a CRT. The CRT in …read more http://pje.fyi/P8lzmX

Paul Jacob Evans

Your Next Desktop… QNX?

QNX has a long checkered history as an embedded operating system. QNX was always famous for being a real time operating system with a microkernel architecture. That is, kernel functions run as a set of coordinated tasks instead of as a single piece of code. A recent release of QNX 7 (see video, below) allows it to run on 64-bit desktop computers and [elahav] decided to tackle turning this embedded RTOS into a desktop operating system.

That might sound far-fetched, but QNX is a POSIX-compliant system and has all the features you’d expect in a system like Linux or BSD. …read more http://pje.fyi/P3gNxV

Paul Jacob Evans

The Improved Luggable PC

There are exactly two types of personal computers available today. If you need a lot of horsepower, a powerful GPU, or a full-power CPU, you’re going to end up with a desktop. If you need something portable, you’re getting a laptop with a wimpy CPU and an underpowered GPU. Historically, there has been a third type of PC, the luggable. The luggable is a desktop PC crammed into a case that makes it slightly more portable than a desktop and a monitor.  You cannot buy a luggable PC case right now. They simply do not exist as a commercial product …read more http://pje.fyi/Nvhg3C

Paul Jacob Evans

PC In A Mouse

[Slider2732] got his Orange Pi Zero working with a 3 watt amplifier, wireless keyboard (with built-in mouse), and car reversing monitor. But he needed a case to house it in. He remembered that he used to make parameters for ghost hunting by filling PC mouse cases with all sorts of electronics. So why not put the Orange Pi Zero in a mouse too? Looking through his mouse collection, he picked out an old Logitech optical mouse and went to work.

We like that the Logitech has transparent bottom halves, perfect for proving to anyone who might be skeptical that the …read more http://pje.fyi/Nt1MYP

Paul Jacob Evans

Magsafe 1 to Magsafe 2 The Cheap Way

[Klakinoumi] wanted to use their Magsafe 1 charger from 2007 with their newer Macbook Pro Retina from 2012 — but it had a Magsafe 2 port. There were a few options on the table (buy an adapter, buy a new charger, cry) but those wouldn’t do. [Klakinoumi] went with the brute force option of grinding a Magsafe 1 charger to fit Magsafe 2.

Based on the existence of passive adapters that allow Magsafe 1 chargers to work with newer laptops, we’d assume that the older chargers are probably electrically similar to the newer models. That said, it’s not our gear …read more http://pje.fyi/NlSjyk

Paul Jacob Evans