[Coco] OS-9 How to sense any key ?

[Kip Koon]

Hi Luis!
I have had people tell me that they can't find the any key!  :)  For real!
I've had to tell them the any key does not exist so I would have to say that
it is impossible to sense the any key!  :)  I thought that might amuse you!
:)  
Kip

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
Behalf Of Luis Antoniosi (CoCoDemus)
Sent: Thursday, March 27, 2014 10:06 PM
To: CoCoList for Color Computer Enthusiasts
Subject: [Coco] OS-9 How to sense any key ?

I checked the KeySns GetStt but it seems to sense only control + cursor
keys.

On cp/m i need to do:

* sense if there is any key pressed
* get the key without removing it from the queue

this is the function I need to repdroduce. DbaseII uses that:

BDOS function 6 (C_RAWIO) - Direct console I/O

Supported by: CP/M 1.4 and later, with variations

Entered with C=6, E=code. Returned values (in A) vary.

E=0FFhReturn a character without echoing if one is waiting; zero if
none is available. In MP/M 1, this works like E=0FDh below and waits
for a character.E=0FEh[CP/M3, NovaDOS, Z80DOS, DOS+] Return console
input status. Zero if no character is waiting, nonzero
otherwise.E=0FDh[CP/M3, DOS+] Wait until a character is ready, return
it without echoing.E=0FCh[DOS+] One-character lookahead - return the
next character waiting but leave it in the buffer.

Values of E not supported on a particular system will output the
character. Under CP/M 2 and lower, direct console functions may
interact undesirably with non-direct ones, since certain buffers may
be bypassed. Do not mix them.


-- 
Long live the CoCo

--
Coco mailing list
Coco at maltedmedia.com
http://five.pairlist.net/mailman/listinfo/coco