

BAS21.BWR
September 1981
COPYRIGHT (C) 1977, 1979, 1981  BY
DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.


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BAS21.BWR                                                         Page 2


BASIC.BWR
September 1981


     KS processors have a microcode problem such that the program

        10      REM MICROCODE BUG DEMONSTRATOR
        20      READ P,R
        30      IF P=-9999 THEN 70
        40      LET I=P*R
        50      PRINT "INTEREST IS";I
        60      GO TO 20
        65      DATA 1400,.056,3800,.038,4200,.045,-9999,-9999
        70      END

will print four lines of output and then die with           ____

        ? 57  End of DATA found at line 00010 of MAIN PROGRAM

The microcode deficiency is causing  the  first  -9999  to  be  read  as
-9999.0001,  so  the  test  in  line 30 is failing.  In cases like this,
line 30 may be changed to read

        30      IF P==-9999 THEN 70

so that the test is satisfied if the values are approximately equal.

     This problem will be fixed in the next release of the KS microcode.
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