Not so much a bug, as slow!

[boriel]

There was a bug in the PNG listing in both the POKE statement and in the PEEK argument. 23674 got written as 26374.

hock: OMG!!
I overlooked that!! Thank you.
Anyway, I've found a floating point library. It is faster, but a bit less precise (it's like the traditional Ansi C IEEE FP library, 4 bytes per float, not 5). I guess I can implement it, and will be much faster, a bit less precise (but enough for most purposes), and take more memory. But more important: it will allow FP calculations in many Z80 machines, like SNES not having FP Rom routines.