[syslinux] kbdmap & ASCII > 128
Josef Siemes
jsiemes at web.de
Wed Oct 16 12:21:50 PDT 2002
Hi,
I've just played around with kbdmap in pxelinux. I always wondered why there was no
translation for "AltGr"-Keys (the right 'Alt'-Key) (AltGr-Q generates "@" on a german
keyboard e.g.), and I found in conio.inc (syslinux 1.76):
getchar:
[..]
.kbd: xor ax,ax ; Get keyboard input
int 16h
and al,al
jz .func_key
mov bx,KbdMap ; Convert character sets
xlatb
.func_key: ret
So (from my small knowledge about asm ...) the character is read, tested for something (the
'and'/'jz' - is this a test for >127?), and only if that didn't return zero the keymap translation
is done. Why isn't every character translated? Is there some problem with this? Since the
characters above 127 are also in the kbdmap-table, there should be no problem in translating
them all? Or does the bios treat characters >127 different?
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