What a structure has keyboard layout?

[MIRKOSOFT]

Hi!


I want to create my own C128 keyboard layout.
This is the solution:
Vector - Key
-----------------
830-831/$033E-$033F Unshifted
832-833/$0340-$0341 SHIFT
834-835/$0342-$0343 Commodore
836-837/$0344-$0345 CONTROL
838-839/$0346-$0347 ALT (same as unshifted)
840-841/$0348-$0349 CAPS LOCK

Address: International - National
-------------------------------------------
64128/$FA80 - 64809/$FD29 Unshifted
64217/$FAD9 - 64898/$FD82 SHIFT
64306/$FB32 - 64987/$FDDB Commodore
64395/$FB8B - 64395/$FB8B CONTROL
64128/$FA80 - 64809/$FD29 ALT (same as unshifted)
64484/$FBE4 - 64809/$FD29 CAPS LOCK (in case of ASCII/DIN same as unshifted)



But really don't know structure of layout.
Also German keyboard has ´ and ` which waits on some keys and when found match displays e.g. á...
So, can anybody explain to me this?


Many many thanks for every help.


Miro

[Hydrophilic]

I don't know about special features of German C128, but I do know about layout for each "shift mode" (normal / Shift / Commodore / Control / Alternate / Caps Lock).  These are usually called a "keyboard matrix".  There are 6 matrices... one matrix for each "mode".  Each matrix is referenced by a pointer (vector) in RAM like you say ($033E ... $0349).

Each matrix is the same as shown below (for another perspective, see my web page)...

Code Select Expand


$xx00 [INST/DEL] [Return] [CRSR =>] [F7]        [F1]          [F3]  [F5]  [CRSR \/]
$xx08 [#/3]      [W/w]    [A/a]     [$/4]       [Z/z]         [S/s] [E/e] [Left/Shift Lock]
$xx10 [%/5]      [R/r]    [D/d]     [&/6]       [C/c]         [F/f] [T/t] [X/x]
$xx18 ['/7]      [Y/y]    [G/g]     [(/8]       [B/b]         [H/h] [U/u] [V/v]
$xx20 [)/9]      [I/i]    [J/j]     [  0]       [M/m]         [K/k] [O/o] [N/n]
$xx28 [  +]      [P/p]    [L/l]     [  -]       [>/.]         [[/:] [  @] [</,]
$xx30 [  £]      [  *]    []/;]     [CLR/HOME]  [Right Shift] [  =] [  ^] [?//]
$xx38 [!/1]      [<- ]    [CTRL]    ["/2]       [Space]       [ C=] [Q/q] [Run/Stop]
$xx40 [Help]     [ 8 ]    [ 5 ]     [Tab]       [ 2 ]         [ 4 ] [ 7 ] [ 1 ]
$xx48 [Esc]      [ + ]    [ - ]     [Line Feed] [Enter]       [ 6 ] [ 9 ] [ 3 ]
$xx50 [Alt]      [ 0 ]    [ . ]     [/|\]       [\|/]         [<- ] [-> ] [No Scroll]

There are a few things to note.  First, the address is almost never a simple number like $FC00; for example the normal (no shift) first row is $FA80, and so second row (above labeled $xx08) is at address $FA88.  I hope that makes sense!

Second, the values in the table(s) are PETSCII codes.  So for exampe the first entry (INST/DEL) is PETSCII code $14 (DELete) in most tables (unshifted) but is PETSCII code $94 (INSerT) in the SHIFT table.  As another example, the first key in the second row is often "number 3" ($33), but could be pound/number/octothorpe (#) in SHIFT table ($23), or could be PETSCII-Red ($1C) in Control table.  I hope that makes sense!!!

Third, many entries use an "undefined" value of $FF.  For example pressing [CTRL] + [INST/DEL] will look-up a value of $FF.  Normally this should do nothing, but I have not examined the ROM enough to be certain...

I hope that helps!