Okay, I have no new project now, so I decided to publish some of my saved pages as tips for you.
C compiler for 6809
Pierre Sarrazin made a cross compiler for C
The processor circuit itself, as we designed it in the last chapter, is of no use. Respectively - you can plug it in, connect the data bus via resistors (ca 10k) to ground
I have a special relationship with the ZX Spectrum. It was the first computer I ever had that fascination with technology - you plugged it into the TV, recorded programs from a tape,
For a precision clock source being the heart of every computer, we didn't really bother with custom oscillators. We didn't have to - all the processors we used had a built-in oscillator, and
I'm preparing the sequel to my book, Sticks, Volts, Monochips. This time I'm going to cover the design of osmibit computers. The book should be published in 2019 again in the CZ.NIC