Hacking a Roland CAMM3 PNC-3000

[Robin Hewitt]

I replaced the EPROM so it now comes up and wants to communicate, lets me upload programs and run them.

Just did "reading the buttons". I can see the XYZ positioning encoder knobs on the front panel are going to be tricky.

To read the panel buttons and encoders I have to clock the data out serially by reading two dedicated port addresses. No problem except for the encoders which are odd. I get a direction and a brief pulse to say it's moving. Blink and you've missed it. They are not making this easy. Resisting the temptation to rewire it so I read the encoders raw :naughty:

Worry about that later, they've probably fine tuned the pulse to one step in crawl mode so I just read once per interrupt.

Next, lighting the LED's and setting the XYZ co-ordinate displays. Then I'll fire up the interrupts and get her moving again.

Still waiting for bits to do the new spindle. Bought the Ampflow E-150 DC motor and it looks delighful. Slightly concerned about how much heat it can dump into the metalwork without overheating, may need an extra fan. It's rather apart at the moment, you can see the 35mm round rails supporting the head. Feels fairly solid