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

[Luis Antoniosi (CoCoDemus)]

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.


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