Oooooh, shiny!

After wrangling Eagle a bit to let me make a regular sized qwerty keyboard, I ended up just using it to draw things and trace an outline and moving the actual electronics to a separate board.

The controller is made by overlaying a bunch of the circuits before printing the tone transfer sheet.

The code for the daisy-chained keyboard works, though I had to add 1 more instruction. I've got a "clever" hack, whereby I reuse a portion of the ISR as a subroutine and keep the retfie to both return and re-enable global interrupts. The only problem is that it also corrupts PCLATH with garbage because it isn't an interrupt. You see, normally the interrupt saves a bunch of things in shadow registers before it hits the ISR, and retfie restores all this for you, but in my case the first call is made form main code, and the shadow registers are not yet initialized. Interesting things happen when PCLATH is loaded with garbage right before you try to make a call...

So 61 total instructions, or 106.75 bytes. That should still leave plenty for receiving.