collapseos/blk/004

21 How blocks are organized    22 Addressed devices
23 Branching
Fix blk overflow in usage guide index 2020-05-23 10:39:28 +10:00			`21 How blocks are organized 22 Addressed devices`
Limit ourselves to 8-bit branching I'm planning on going back to 8-bit branching. 16-bit br cells incur a non-negligible penalty and, while at first 64 words (128 bytes forward or backward) seemed a bit limiting, I now don't see why one would ever construct such a big branch. It would be un-forthy. Also, I looked at using BC instead of IY to hold IP and the transition would be a lot easier with 8-bit branching. In this commit, all I do is add overflow checks in IF. The mechanic below doesn't change. I'll give myself some time to think it over so that I avoid yet another back and forth. 2020-05-25 00:01:46 +10:00			`23 Branching`