Re: Mouse wheel is now supported in vDos-lfn

["Carl Distefano" cld@xxxxxxxx]

Reply to note from Harry Binswanger  Sun, 28 Aug 2016
21:33:26 -0400

Harry,

> But for the record, XyWrite reports the scancode of Ctrl-w as
> 2065. That's from the U2's SCAN frame.

XyWrite 4's "scan code" () reflects the shifted state, but, as
generally used, the term scan code does not. The latter corresponds to
Xy4's "key code" (), which identifies the pressed key without
regard to the shifted/unshifted keyboard state.

For the record, Xy4's scan code is the same as the key code for
unshifted keys, and equals the key code plus 256*(2^n), where n ranges
from 0 to the number of TABLEs in the loaded KBD file minus 1, for
shifted keys. The value of n depends on the ordering of the TABLEs in
the KBD file (n = 0 corresponds to the *last* TABLE). The scan codes
for shifted-key combinations, like Alt-Shift, are calculated
additively, so that if, for example, the scan code of unshifted Esc is
1, the scan code of Ctrl-Esc is 513 (1 + 256*(2^1)) and the scan code
of Alt-Esc is 1025 (1 + 256*(2^2), then the scan code of Ctrl-Alt-Esc
is 1538 (513 + 1025).

But XyWrite's concept of scan code (and thus U2 frame SCAN) is
irrelevant to the conversation you're having with Wengier.

--
Carl Distefano
cld@xxxxxxxx