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KEYSTAT.SRC
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1986-05-06
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693b
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24 lines
{<<<< KeyStat >>>>}
{ From: COMPLETE TURBO PASCAL by Jeff Duntemann }
{ Scott, Foresman & Co. 1986 ISBN 0-673-18600-8 }
{ Described in section 20.6 -- Last mod 2/1/86 }
{ This version specific to PC/MS DOS }
FUNCTION KeyStat(VAR Ch : Char) : Boolean;
TYPE
RegPack = RECORD
AX,BX,CX,DX,BP,SI,DI,DS,ES,Flags : Integer
END;
VAR
Registers : RegPack;
BEGIN
Registers.AX := $0600; { DOS call 6: Direct Console I/O }
Registers.DX := 255; { Selects non-echo read function }
MSDOS(Registers); { Make the DOS call }
Ch := Chr(Registers.AX); { The character is returned in AX }
KeyStat := Ch <> Chr(0)
END;