Programming PALs

[Badwolf]

Well progress, but not fully working yet.

discprompt.jpg

Running the program results, for the most part, in a black screen. Pressing reset brings up the following. This looks promising, but nothing further occurs. No disc drive activity, no signs of response to keyboard input.

Running the program without the card installs leads to a hang with the desktop showing, so definite signs of some life occurring there. Incidentally, running the program without the 286 installed produces that same desktop hang, so also an indication the processor is detectable.

I don't suspect data or address line shorts on the Falcon side as I get far enough to run the program, but perhaps there exist some on the 286 side, so that'll be something to check, however the reset behaviour strikes me as odd and is not what the manual says should happen, so that will probably be my first port of call.

This Falcon's reset circuit is not the best (I've investigated it before), so it's possible it's connected.

The 'scope will have to come out!

BW