What s a Varvara and why does that pi pico 2 look a little different? Let s dive into that! Varvara is a specification for a computer system, which uses the Uxn virtual machine and describes how things like a display, mouse, keyboard and such should react. Uxn, in term, is a spec for a virtual machine [ ] The post Running Varvara on a Pi Pico 2 appeared first on jaeblog .
It s been a while, but let s finish that tube amp project and see why you should likely not build one yourself! But before we get into the details, a quick recap of the first part.The amplifier is a hybrid amplifier using a ECC86 as voltage gain stage, combined with a transistor buffer to drive headphones. [ ] The post Low voltage tube amp part 2 appeared first on jaeblog .
A bit of history and a repair of a Tektronix 4051 graphical computer from 1975. What was this computer's place in history, what was it used for and what parts exploded when turning it on. The post A vector graphics workstation from the 70s appeared first on jaeblog .
Do I need another headphone amp? Nah. Do I want to build one? Yeah! And this time one using a low voltage tube, the ECC86. So let s dive into this fun little tube, some alternatives, and design a headphone amp around it. I will cheap out a bit and make a hybrid one though :) [ ] The post A low voltage tube amp! appeared first on jaeblog .
More old tech, more blog posts. This time about a Thinkpad 220. No, not the X220, the 220. A 1993 vintage, Japan only, ultra compact Thinkpad! There is not much online about these so let s fix that! I saw one of these laptops for sale, untested, on Marktplaats. A Dutch Ebay so to say. It [ ] The post Disassembling a Thinkpad 220 from Japan appeared first on jaeblog .
First things first: This is the first post of the year, halfway in the year. A move got in the way but a few fun things are in the pipeline :)With that out of the way, let s take a peek in how small computing could be in the early 1990s. Nowadays small form factor computers [ ] The post Restoring a SUN SPARCstation IPX lunchbox computer appeared first on jaeblog .
I always liked the idea of Litex, a framework to easily build a SoC for an FPGA, but never really made time to try it out. So let s change that and write down how it went! I am using a Sipeed Tang Nano 9K FPGA board, which is a fairly cheap bit of kit, but [ ] The post Getting started with Litex on a Tang Nano 9K appeared first on jaeblog .
A long while back I picked up an old Tektronix logic analyzer. It was in decent shape but threw an error on the self test. To be more specific, the triggering board was faulty. But that means it was almost free and how can I say no to a repair job! Especially to some weird [ ] The post Repairing a Tektronix 1240 logic analyzer appeared first on jaeblog .
Ok ok ok, this is not a Nixie, it s a Panaplex watch, but that sounds so much less fun. They work like nixies, but they are flat and often 7 segment displays, somewhat common in alarm clocks and tech gear.I got a few of them from a friend and compared to nixies, they are rather [ ] The post Let s build a nixie watch appeared first on jaeblog .
Yes I bought more 1980s computers. This time an HP9000/310. This is a computer launched in 1985 meant to control measuring equipment via HPIB, the interface later renamed to GBIP and still in use today. Now, a computer from the 80s meant to control EE equipment is not something I could not buy right? The [ ] The post Computing like it s 1985! appeared first on jaeblog .