My little collection of nerdy stuff I do in my private life…

Where do we continue? First: the battery The battery in my 4957A was completely empty and had first signs of leakage at some pins. So it had to be replaced immediately. Unfortunately this battery stack is not available any more.…

Uhh not pretty anymore A couple of days ago my 4957A arrived from Frances. It worked for a few minutes until the Schaffer line filter exploded quite impressively. You can see the dirt around the emergency pressure hole at the…

Fixing the signs of time Finally I got everything delivered. A couple of caps, a new, hopefully quieter fan and of course the RIFAs which were the reason to pull everything apart. Putting all the caps in is a nice…

Hacking Basic I/O Map What you can see in the picture above is my current version of the 4951C I/O map. As you might know, the device is Z80 based (a NSC800, which is a Z80 with an 8086 compatible…

Using old school split flap display as modern clock What is it Everyone knows the split flap display from old airports or train stations and the natural “flapping” sound they make when being operated. These display have long been replaced…

Illumination of your bottle collection What is it BottleBoard is an Arduino based shelf with (in my case) 10 slots for bottles or glasses, which will be illuminated from the bottom to let them shine. The 10 lights are on…

What is it The clock is driving three VGA monitors, each of them displaying two digits from the current time. The clock is DCF77 synchronized (this is a time broadcasting station in Germany), so it always gets the right time.…