On Wed, 2007-05-30 at 23:35 -0400, Rick Troth wrote:
> On an 'xterm', pressing F1 delivers an <ESC>[224z sequence.
> One way to get full-screen 3270 interaction to ASCII apps
> is to have the 3270 PF1 AID converted to an <ESC>[224z sequence.
With the current 3270 driver in 2.6.x kernels some PFx AID keys are
already translated to meaningful escape sequences. For example PF1 AID
is translated to "\033[[A" which is F1 in the vt100 world.
You can change the translation with the "loadkeys" user space tool. The
3270 driver uses a little trick. loadkeys is normally used to do the
input translation of raw keyboard keys. The 3270 driver uses the
translation table defined with loadkeys for the output as well. This way
it is possible to change the code page that is used with a particular
device. Just define a new map file an feed it into loadkeys. The map
file contains a section where you can replace keys with strings, here is
the line for the PF1 translation:
string F1 = "\033[[A"
The PF1 key itself is mapped as
shift control keycode 113 = F1
The keycode tables in linux are 128 bytes long but there are several of
them (keycode, shift keycode, control keycode, ...). On the 3270 side we
have 8 bit characters and the AID prefix. The AID prefix codes get
translated to 256 + character, so there are keycodes 0-511. For example
PF1 is EBCDIC 0xF1 but it always is preceeded with an AID, that makes
the keycode for PF1 0x1F1. Four keymap tables are used to cover
everything, "keycode" for 0-127, "shift keycode" for 128-255, "control
keycode" for 256-383 and "shift control keycode" for 384-511. So for AID
PF1 0x1F1 this translates to "shift controlf keycode 113". It is a bit
awkward but I did not want to write new user space tools. You'll find
the default keymap in linux/drivers/s390/char/defkeymap.map. Change at
will, load it with loadkeys and watch :-)
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
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