Nearly a decade ago, I wrote a post about building a serial adapter/cable for the FX-880P (and FX-850P) calculator. The design I went for was a bit over-engineered. The circuit was made of two independent parts on the same PCB; one that was a straight connection to the calculator via a 15×2, 1.27mm pitch header, […]
Some Background I’ve been collecting calculators for a while, and very recently I’ve been obsessed with the Voyager series of RPN calculators designed and manufactured by HP in the 80s. While the series included several gems, like the HP 15C “Advanced Scientific Calculator”, and the HP 12C “Financial Calculator”, the most elusive model for me […]
Almost 3 years ago I developed and published ZEPPP, my Arduino-based, “Zero-External-Parts” PIC Programmer, and wrote about it here on my blog. From time to time I hear from people using it, and, sometimes I would also get questions about whether specific PIC devices are supported. Now, ZEPPP is pretty limited in scope, as it […]
So in my first adventure with the STONE displays I wrote a simple Arduino library to communicate with them, and ported the firmware-side of the included example to my library to make sure it was working properly. However, writing that library was not the end goal. I wrote it to make it to get familiar […]
HMI?! HMI stands for Human Machine Interface, which is a fancy way of describing an element that enables the interaction between a human and a machine. In this case, we will be talking about HMI displays. In particular HMI displays manufactured by a company called STONE. What makes their screens different to regular touchscreens? Well, […]
Tape recorders, computers and capture cards all seem to be happy to accept a microphone input for adding audio or voice-overs, but very few have a “line input” to overlay music or any other “strong” signal source instead.
One of the things I’ve been interested in for the last year or so, is developing for the Atari family of 8-bit computers. I haven’t done a lot yet, but I’ve been slowly getting software, docs, and hardware to start writing code with all the tools I could possibly need. I had already built a […]
I’ve had a VC99 multimeter for a while, and one of the nice things about it, is that it can be hacked to give it RS232 output pretty easily. The hack is possible because the VC99 uses a rather standard DMM chipset that has serial-output capabilities built-in. You can check if the feature is there […]