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From: apratt@atari.UUCP (Allan Pratt)
Newsgroups: comp.sys.atari.st
Subject: Re: Control-F1, Alt-F1 ??? - (nf)
Message-ID: <766@atari.UUCP>
Date: Thu, 25-Jun-87 13:32:00 EDT
Article-I.D.: atari.766
Posted: Thu Jun 25 13:32:00 1987
Date-Received: Sat, 27-Jun-87 04:22:54 EDT
References: <19400005@qtecmuc.UUCP>
Organization: Atari Corp., Sunnyvale CA
Lines: 29

in article <19400005@qtecmuc.UUCP>, ger@qtecmuc.UUCP says:
> does anyone know, if there is a way to distinguish between
> Functionkey F1, ALT-F1 and CTRL-F1 using C (MWC).
> All routines like Bconin or Crawcin don't make a difference at all.

What you need to remember is that the BIOS and GEMDOS calls return
a LONG value.  The highest byte of this value can contain the shift-key
state when the key was hit.  You tell the OS to put the shift key state
in that byte by setting bit 3 in the (published) system variable "conterm"
to 1 (that is, *(char *)0x484 |= 4;).  Better clear it again before
your program exits, though, because the desktop might not be able to
handle it (use *(char *)0x484 &= ~4;).

The upper byte is bit-mapped as follows (0 means up, 1 means down):

Bit	Key
0	Right shift
1	Left shift
2	Ctrl
3	ALT
4	Caps-lock (toggles with each press of the key)
5	Right mouse button
6	Left mouse button
7	Reserved, currently zero

/----------------------------------------------\
| Opinions expressed above do not necessarily  |  -- Allan Pratt, Atari Corp.
| reflect those of Atari Corp. or anyone else. |     ...lll-lcc!atari!apratt
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