Solving differential equations on a 6502 with Woz's floating point code

I find it funny that people enjoy the nostalgia of things like 6502... I loved my Atari 800XL, but wistfully dreamed that computers might one day be able to handle 320x240 with 256 colours.... boy... that would be good! Meanwhile I was hand assembling 6502 into data sections in basic so I could try and draw a circle... who knew drawing circles was so ridculously difficult and slow?<p>Having said that, I do like this stuff in hindsight :)

Not the floating point, but saw his code for other parts of the 6502 Apple products, he really was a genius. The code is both very clever AND quite understandable.<p>My understanding is his circuit design was similar. One thing, use a part of the circuit for two different things at different points of the clock cycles, so parts count was reduced.

Is that first-order approximation appropriate for iteratively solving the Diff EQ? Or does a higher order method such as Runge-Kutta have to be used? I notice the graphs don&#x27;t align perfectly...

Very interesting ... thanks for pointing to py65 as well

Awesome. I love projects like this.