;
; SYSLIB Module Name:  SCONDI
; Author:  Richard Conn
; SYSLIB Version Number:  2.0
; Module Version Number:  1.0
; Module Entry Points:
;       CONDIN
; Module External References:
;       CIN             CST
;

;
;  SCONDIN.MAC --
;       Conditional Input Routine
;       When called, returns w/zero flag set if character not available
;         from CON: or character in A and flag not zero if character
;         available
;       Only PSW affected
;

;  Externals --
       EXT     CST     ; CONSOLE STATUS ROUTINE (A=1 IF NOT RDA)
       EXT     CIN     ; CONSOLE INPUT ROUTINE

CONDIN::
       CALL    CST     ; GET STATUS
       ANI     1       ; MASK LSB
       CPI     1       ; SET ZERO FLAG (Z=NOT RDA)
       RZ
       CALL    CIN     ; GET CHAR
       RET

       END

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