Retromaster’s Electronics Projects

…related to old computers and other assorted stuff…

TFE+ A500 Keyboard Progress

Posted by retromaster on February 24, 2010

I received the parts I ordered for TFE+ yesterday evening, so I started working on the Amiga keyboard interface right away.

The photo shows an ATtiny24 on a breadboard with the A500 keyboard connected to it. I wrote a few lines of C code to read the output of the keyboard (as described in the Appendix H of the Amiga Hardware Reference Manual) and after a little bit of debugging, got it to work. When I press space, the red LED on the breadboard lights up (I did not connect the keyboard LED lines, that’s why those are not lit up).

Now that I can capture keypresses, the next stage will be to implement additional circuitry to prevent them from going to the Amiga mainboard when TFE+ is activated.

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