Aamir.Zakaria@samba.acs.unc.edu (BBS Account) (08/29/90)
Can anyone tell me how, in either C or assembly language (8088), I can poll the keyboard for character input without actually waiting for input, i.e. just check if the user has hit a key. Thanks!
david@gisatl.FIDONET.ORG (David Deitch) (09/01/90)
In a message of <Aug 29 04:58> BBS Account (Aamir.Zakaria@samba.acs.unc.edu ) writes: > Can anyone tell me how, in either C or assembly language (8088), I can > poll > the keyboard for character input without actually waiting for input, > i.e. > just check if the user has hit a key. One of the INT 16 interrupts does this, but off the top of my head I can not remember which one. It will return the scan/key code of the key pressed or empty registers if none has been pressed. If it has been pressed, it is not taken out of the keyboard buffer. Use another one of those INT 16 functionoos for that. David Deitch (GIS) deitch@gisatl.fidonet.org 1:133/411@fidonet -- ----------------------------------------------------------------------------- David Deitch - via FidoNet node 1:133/411 UUCP: galbp!gisatl!david INTERNET: david@gisatl.FIDONET.ORG
gened@gssc.UUCP (Gene Daniel) (09/02/90)
In article <944@beguine.UUCP> Aamir.Zakaria@samba.acs.unc.edu (BBS Account) writes: >Can anyone tell me how, in either C or assembly language (8088), I can poll >the keyboard for character input without actually waiting for input, i.e. >just check if the user has hit a key. > > >Thanks! Most "C" compilers on PC's have a function called kbhit() it returns non-zero if a key stroke is available to be input. This function is available in Microsoft, Borland and Zortech runtime libraries. I seem to remember it has been available ever since the BDS compiler on 8080 CP/M machines. -- Gene Daniel | gened@gss.com Graphic Software Systems, Inc. | or P.O. Box 4900 | ..!tektronix!sequent!gssc!gened Beaverton, Oregon 97005-7161 |
makjr@levels.sait.edu.au (09/07/90)
In article <432.26DFC08D@gisatl.FIDONET.ORG>, david@gisatl.FIDONET.ORG (David Deitch) writes: > In a message of <Aug 29 04:58> BBS Account (Aamir.Zakaria@samba.acs.unc.edu ) writes: > > > Can anyone tell me how, in either C or assembly language (8088), I can > > poll > > the keyboard for character input without actually waiting for input, > > i.e. > > just check if the user has hit a key. > > One of the INT 16 interrupts does this, but off the top of my > > David Deitch (GIS) > deitch@gisatl.fidonet.org > 1:133/411@fidonet > INT 16H , input AH = 01 outputs ZF ready or not signal AH scan code AL character code Kevin Radus