KOJRO Retro innovations

KOJRO Retro innovations is a hobby project of mine where I try to keep alive some of the spirit and feel about computers and electronics that was present in the 70, 80, and 90’s. When things were so simple that one man alone could understand how and why something worked as it did. I have an obsession about service manuals, schematics and the DIY spirit that rose from having all that information available. This channel will be about repairing, modifying, or just presenting and testing old stuff. Commodore is a big part of my past, so the viewer must not be disappointed if there is a Commodore badge on much of the repair stuff. My background is highly technical mostly from a hardware or programming perspective, so for those who like to see game reviews this might be the wrong place to be.

We unpack some long overdue packages down in my shed. Spring cleanout of some old projects..

We unpack some long overdue packages down in my shed. Spring cleanout of some old projects..
The only thing I have that doesn’t suck is the vacuum cleaner. Let’s do some household repair.

The only thing I have that doesn’t suck is the vacuum cleaner. Let’s do some household repair.
We use the Backbit ChipTesterPro to figure out what's going on with the C64/250425, and much more.

We use the Backbit ChipTesterPro to figure out what's going on with the C64/250425, and much more.
This battle with a c64 breadbin was not a complete VIC 2(ry), we dig into some strange 64 behavior

This battle with a c64 breadbin was not a complete VIC 2(ry), we dig into some strange 64 behavior
Just keeping up with the commodores. We touch some keyboards, with varying success.

Just keeping up with the commodores. We touch some keyboards, with varying success.
We tackle more C64’s. First one was easy, we mounted the J-CIA, the other was more of a challenge

We tackle more C64’s. First one was easy, we mounted the J-CIA, the other was more of a challenge
This Commodore was smiling, but we were in for a surprise, and we had to check with the CIA.

This Commodore was smiling, but we were in for a surprise, and we had to check with the CIA.
Can we make this sad looking Commodore 64 breadbin happy again ?

Can we make this sad looking Commodore 64 breadbin happy again ?
A sad looking commodore, and some happy ones

A sad looking commodore, and some happy ones
Again we are touching the IBM AT 5170, EPROM delays, and also about the speed of the XT-IDE BIOS.

Again we are touching the IBM AT 5170, EPROM delays, and also about the speed of the XT-IDE BIOS.
How about that? Even more stuff about UV-EPROMS, There will be a slight 250ns delay

How about that? Even more stuff about UV-EPROMS, There will be a slight 250ns delay
Basic electronics circuit repair and fault finding without schematics

Basic electronics circuit repair and fault finding without schematics
We attempt to repair a motherboard from an IBM 5170 AT PC

We attempt to repair a motherboard from an IBM 5170 AT PC
Learn the lost skills and knowledge of the Logic Probe

Learn the lost skills and knowledge of the Logic Probe
The LB Knipsekasse. We dig deeper in the 4000 series logic and gets friendly with the logic probe.

The LB Knipsekasse. We dig deeper in the 4000 series logic and gets friendly with the logic probe.
The Lars Berg Knipsekasse main board with lots of 4000 series logic

The Lars Berg Knipsekasse main board with lots of 4000 series logic
Another Dumpster find, the 11.3 Inch LCD Touch monitor.

Another Dumpster find, the 11.3 Inch LCD Touch monitor.
We take on another C64, and don’t dare to blame everything on the PLA !

We take on another C64, and don’t dare to blame everything on the PLA !
The Rusty IBM AT 5170, part 2. Throwing ourselves into the deep end

The Rusty IBM AT 5170, part 2. Throwing ourselves into the deep end
The rusty IBM AT 5170

The rusty IBM AT 5170
Evaporust, the movie, or at least the Norwegian blend !

Evaporust, the movie, or at least the Norwegian blend !
The HUAWEI LTE 4G basestation, Is there any spychips in there ?

The HUAWEI LTE 4G basestation, Is there any spychips in there ?
Unboxing lots of 90’s computer stuff

Unboxing lots of 90’s computer stuff
No end to things you never wanted to know about the Commodore C-64 Power. Part 3 in the series

No end to things you never wanted to know about the Commodore C-64 Power. Part 3 in the series
Building a variable load rack for testing PSU's

Building a variable load rack for testing PSU's
Even more you never wanted to know about the Commodore C-64 Power Supply. Part 2 in the series

Even more you never wanted to know about the Commodore C-64 Power Supply. Part 2 in the series
All you never wanted to know about the C-64 Power Supply, and all the implications. Part 1

All you never wanted to know about the C-64 Power Supply, and all the implications. Part 1
Please, I just want to ask you a question about you C64 powersupply !

Please, I just want to ask you a question about you C64 powersupply !
Fun with eproms, the return of the Dekoder. After all, it's only logical

Fun with eproms, the return of the Dekoder. After all, it's only logical