In this series of posts you'll learn to build a set of joystick interfaces for the MicroBeast/NanoBeast, each more capable than the last.
In the 80s, everyone who was a serious ZX Spectrum nerd had the Kempston joystick interface. If you were unfortunate enough that your parents bought you some Protek, DK'Tronix or (horrors!) Interface II nonsense, you kept quiet about it: that kind of gear would get you laughed off
In this post, we'll make our own version of the Kempston joystick interface that I described in part 1. We'll make a slight modification: full address decoding, to avoid any future resource conflicts. We'll keep the 74HC138N (3-to-8 decoder) for decoding the control signals,
In part 2 we built our interface hardware, now it's time to try to read it from the MicroBeast! To do that, we'll have to actually connect it to a MicroBeast, so we'd better clear up the support circuitry we've been using