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I want to start looking at the VGA signals that will be used to produce a graphical output. Being one of the more difficult aspects of the project. Taking ideas from the Ben Eater graphics card, I build up the horizontal timing circuits.
I explain an issue I had when trying to use the circuit without the inverters, which resulted in the SR latch getting very hot. So putting the inverters back into the circuit I measure the timing signals with an oscilloscope and the horizontal timing looks good.
I then explore ideas to build up the vertical timing circuits. After failing with breadboard and a soldered prototyping board I decide to make a PCB. There are further issues with the PCB, but I do finally manage to get some colours on the screen.
Ben Eater's design can be found here:
eater.net/vga