Re: [Freedos-devel] Question of DOSKEY

[Arkady V.B. <ar...@be...>]

Hi!

15-=F1=CE=D7-2004 15:27 _ai...@wa... (Aitor Santamar=DCa Merino) =
wrote to
fre...@li...:

ASM> override DOS' CON and use BIOS services (int 16h), where you can als=
o
ASM> find functions for the shift states and that all. If you want consis=
tent
ASM> data, I guess you should disable interrupts, as you make it in two
ASM> different function calls.

     This not helps, because:

- you may disable interrupts before/after calls to INT 16, but you can't
  prevent them to enable interrupts inside.

- BIOS stores scancode into buffer, but not shift states, thus, at time o=
f
  scancode reading, shift states may anyway already be changed. For examp=
le,
  you press Shift-Ins, then release Shift, but if programs slightly delay=
s
  with reading input, it receives Ins without Shift state turned on.

ASM> For the cases where letters are swapped (e.g. Z<->Y is somewhat comm=
on),
ASM> FD-KEYB2.0 allows you to configure if you want the scancode to be al=
so
ASM> swapped.

     Don't think that this is useful feature.

ASM> implemented). This is so because there's some sofwtare that seems to
ASM> look only at the scancode value (and not the character) from the pai=
r
ASM> (scancode, character) that KEYB returns in the BIOS buffer.

     If program wants _scancode_, then it wants _scancode_, not letter fr=
om
current layout (notwithstanding if this is 3rd party program or BIOS
mappings).