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Design, build and testing version 0.8
Log from Re-UD-80 - a larger display for Epson PX-4 / PX-8
This text is from September 2022 when the first board was designed, build and tested. With clear images of the board and an image of the ROM contents available, it seemed clear that there was enough information available to make a replica. The two main...

How it works
Log from 68020 minimal homebrew computer
IntroductionIn this log, I'll explain in detail how this single-board computer works.8 bits bus onlyThe 68020/68030 have dynamic buses; this means that they are not fixed to 32 bits. A 68020 board can have 32 bits RAM, 16 bits ROM, and 8 bits IO. Of...

Catch Up and Component Selection
Log from Uno 14500
We've been working on this project for a little bit now. Mostly iterating through pen and paper designs and descriptions to figure out what we even want to build, up to the first iteration of the schematic from earlier this week. The design is heavily...

I didn't choose the MCU ... it chose me!
Log from TI-57 Programmable Calculator Hardware Retrofit
I like the STM32 ARM cortex MCU family. They are well documented, readily available, and cheap 'breakout boards' for them abound. The MCU retrofit must fit nicely in the space of a 28-pin 0.6" pitch DIP, so package size is key. The STM32F103 is...

Driving the Display
Log from TI-57 Programmable Calculator Hardware Retrofit
The TI-57 has a multiplexed 12-digit common cathode LED display. The corresponding 8 segments of all 12 digits are connected together; sort of. It turns out that TI economized on IC package pins by ”doubling up” the decimal point segment...

Prerequisites and software
Log from VGA videocard for microcontrollers
Sometimes, when making your own devices on microcontrollers, there is a need to display huge amounts of information on a display and to use a bigger screen for ease of perception. Unfortunately, there are no ready-made and budget-friendly solutions for...

basic protocol structure
Log from VEVOR diesel heater protocol
Some days ago a friend told me about the heaters from Vevor and after some search I found this page very promising: http://afterburner.mrjones.id.au/ So I hoped the Vevor ones have the same protocol structure and things would be quite easy....

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