Electronics hobby blog

If you have old plastic cases that have turned yellow, you can restore them to it's original state just by using hydro-peroxide, some oxy powder, UV light bulbs and patience. In our test we will be restoring an old Canon flatbed scanner cover that had turned yellow

In this project we are going to create a simple BASIC program, then save it to the tape (which in our case will be a wave form on a PC) and in the end convert it to a TZX image file that can be run on a ZX Spectrum emulator like Fuse.

There is plenty of free software available for the 8-bit Atari XL / XE computers online in the form of ATR files. These are image files created from the physical disks. A huge database can be found on Atari Mania website.

A while back I have bought a cheap second hand Commodore 64. Unfortunately it was broken, next to the PLA chip which I have fixed by binding a custom CPLD version of it, the BASIC ROM chip (901226-01) was also broken.

The most important chip in commodore 64 computer is the PLA chip. When this chip is broken, nothing will work and most certainly you will get a black screen after you try to turn it on.

FPGA's and CPLD's are certainly very cool devices. It is possible to create you own logical circuits and emulate real hardware chips on the lowest level. For this test project we will use Alera CPLD which is also known as MAX3000A and it's full code is ALTERA  EPM3064ATC44-10.

I have decided to start a new project and that is to build an arcade cabinet. The first parts needed for the project were delivered, so I wanted to write something about them.

Recently I have bought an Apple Macintosh Plus. Everything was working except one key on the keyboard. The previous owner just glued it permanently to disguise the damage. The key in question is the "Clear" key. It is not used very frequently, that is of course if you are not a heavy user of the Calculator Application. Nevertheless I wanted a fully functional keyboard, so I decided it to fix it.

The MSX2 NMS 8250 that I have, cames with a PHILIPS VW-0030 printer. It is easy to print documents using the MSX2 Home Office 2.0 application, but I wanted to be able to print from a Windows PC.

To create single sided disks on a PC (Windows XP) we will need a floppy drive that is connected to the FDD controller. The tests that I have done with USB floppy drive failed. It simply did not want to recognise single sided (360K) formatted floppy disks.