Let the gaming begin! Today the first prototype board for functionality in Stage2-3 arrived. It was the addon for a dual joystick port based on the 6522 VIA chip. The board is based on the Prototype Expansion Header located on the Stage 1 board and is included in the design for Stage 2. The other part I want to make a prototype for, before ordering Stage 2, is the IRQ handler, a circuit that can handle prioritized IRQ requests and…
Don’t be cheap, you’ll be sorry later… For three days I have now been trying to get the board running correct. First i found that i had forgotten to set a stackpointer pointing to a place in RAM and thought thats why I could not get the return from subroutine to work. I fixed that and saw in analyzer log that it was writing return address to correct place but when it was reading it back it got wrong… So……
Making things run The first prototype boards for stage 1 arrived a week ago and I started soldering components emediately. I made a small test program, just to see what happens and programmed the EEPROM and the GALs accordingly. And…. Nothing! I should have known that nothing goes according to plan in diy electronics. But since I actually measured every pin and connection on the board before any circuits where added, I, with at least with a small certaincy, knew…
Making sounds for the µLInd When I woke up this morning I felt an urge to make a footprint for one of the peripherals that is planned for the µLind: the Audio Expansion Card! The final design for µLind has 3 expansion ports: the Video Expansion Port (VEP), the Audio Expansion Port (AEP) and the General Expansion Port (GEP). So I wanted to make a footprint for the AEP so I could start thinking about sound options for the µLind….
A long and windy road to insanity Today I finally finished the first stage of the µLind computer! Yeay! After several hours of designing and discussing design options with my partner in crime, my son, I have finally sent the first stage for fabrication. The first stage you say, what is that? Well after several months of grinding in KiCad I suddenly realised that I was bored with the project, just because I did not get anywhere. I wanted to…